If you sell on Amazon using both FBA and merchant-fulfilled (MFN/FBM) methods, you already know that keeping pricing consistent across both fulfillment types is harder than it looks. Run one blanket repricing strategy across all your listings and you're likely leaving money on the table, triggering unnecessary price cuts, or watching your MFN margins evaporate because your repricer doesn't know FBA from FBM.
This guide walks you through exactly how to set up fulfillment-aware repricing rules, with FBA as your primary Buy Box strategy and MFN handled as a controlled, profit-protected fallback. By the end, you'll have a working configuration you can apply to your catalog right away.
Who this is for: Amazon sellers running both FBA and MFN listings on the same or different ASINs, who want to win the Buy Box without triggering price wars or sacrificing margin.
Prerequisites: An active repricer account (steps are demonstrated using Informed Repricer), access to your Seller Central shipping rates, and a working min/max price set for your target SKUs.
Estimated time: 30-45 minutes for initial setup; 15 minutes for QA testing.
Why FBA + MFN listings need separate repricing logic
On Amazon, a single ASIN can carry offers from FBA sellers, MFN sellers, and Amazon itself, all competing for the same Buy Box. The customer sees one price. The repricer, though, needs to understand that an MFN offer at $24.99 is not the same as an FBA offer at $24.99, because the MFN seller is absorbing shipping costs the FBA seller isn't.
Treating them identically creates two problems:
- Your FBA listings chase MFN prices they don't need to match. Amazon's Buy Box algorithm already gives FBA offers a structural advantage, so competing with MFN on price is often unnecessary and damaging to margin.
- Your MFN listings ignore shipping in their guardrails. If your repricer sets a floor of $22.00 per item and you're paying $4.50 to ship, your real floor needs to be $26.50. A repricer that doesn't factor in landed price will let you sell below cost.
The goal here isn't to be the cheapest seller on the page. It's to win the Buy Box at the highest defensible price, with each fulfillment type playing by its own rules.
Which repricer works for both Amazon FBA and merchant-fulfilled listings?
Several repricers claim support for an Amazon repricer FBA FBM strategy. Seller Snap markets itself as optimized for both FBA and FBM sellers and factors in fulfillment method as part of its Buy Box logic. BQool's FBA repricer includes fulfillment-type exclusions in its customization options. Aura's help documentation (as of November 2025) explains that it "reprices both FBA and MFN listings the same, staying within your set min/max price range," and you can separate targeting by setting the Competition Type to "Lowest FBA" to exclude MFN offers from your FBA strategy.
These are real capabilities. The gap across most of these tools, though, is the lack of a clear, step-by-step configuration playbook for mixed-fulfillment sellers. Marketing pages say "supports FBA and FBM." They rarely show you how to set up the rules.
Informed Repricer is built for exactly this setup. Its "Prioritize FBA Listings Over MFN" feature lets you configure fulfillment-aware strategies directly, so your FBA listings compete against FBA offers first, and your MFN listings operate within their own guardrails with shipping costs properly factored in. The platform's profit-focused algorithms are designed to find the highest price that still wins the Buy Box, not just the lowest price that matches a competitor. For sellers running both fulfillment types, that distinction matters.
Step-by-step: configure your FBA vs MFN repricing strategy
Step 1: Create a dedicated strategy for your FBA listings
Don't combine FBA and MFN listings under a single strategy. Start by creating a strategy specifically for your FBA SKUs.
In Informed Repricer, navigate to Strategies and click Create New Strategy. Give it a descriptive name like "FBA - Buy Box Priority" so it's easy to identify later. Select a competition-based rule type that targets the current Buy Box price or the lowest FBA offer, depending on your catalog's typical competitive landscape.
This separation is foundational. Every setting you configure from here affects only FBA listings, so you're not accidentally applying FBA-appropriate margins to MFN SKUs.
Step 2: Enable "Prioritize FBA" targeting
Inside your FBA strategy, locate the fulfillment targeting options. In Informed Repricer, this is the "Prioritize FBA Listings Over MFN" setting. Enable it.
What this does: your repricer will target FBA competitor offers first when calculating price moves. MFN offers on the same ASIN are deprioritized. This prevents your FBA listing from dropping to match a low-shipping-cost MFN seller that doesn't actually pose a real Buy Box threat to your FBA offer.
If you're familiar with Aura's approach, the concept is similar to setting their Competition Type to "Lowest FBA," which their documentation describes as targeting "the lowest eligible FBA offer on the ASIN, excluding any MFN offers." Informed Repricer's implementation keeps the same principle but integrates it directly into the profit-aware algorithm rather than requiring a manual competition type override.
Step 3: Set min/max guardrails using landed price logic
This is where a lot of sellers get into trouble. Your minimum price must account for the total cost a customer pays, not just the item price.
For FBA listings, your min price should cover: cost of goods + FBA fulfillment fee + referral fee + your target margin. That's straightforward.
For MFN listings, the math changes. The landed price is the item price plus the shipping charge the customer pays. Aura's documentation describes this directly: "Aura reprices based on the 'Landed Price', i.e., the amount charged to the customer (item price + shipping)." The same principle applies in any properly configured repricer, including Informed Repricer.
In practical terms: if your item costs $12.00 and you charge $4.99 shipping, your effective landed price is $16.99. Your minimum item price guardrail must be set high enough that when shipping is added, the landed price still covers your costs and margin. If your repricer pulls MFN shipping charges from Seller Central automatically, verify that the live shipping rate matches what you're actually charging customers. Discrepancies here are the most common cause of MFN guardrail failures.
For SKUs where you're absorbing shipping (free shipping offers), add your shipping cost to the SKU's cost field or an "Additional Cost" field if your repricer provides one. Both Aura and Informed Repricer support this approach.
Step 4: Create a separate MFN strategy with its own guardrails
Go back to Strategies and create a second strategy: "MFN - Controlled Fallback" (or similar). Assign your merchant-fulfilled SKUs to this strategy only.
Set the competition scope here to include MFN offers, since that's the relevant competitive set for your MFN listings. Configure your minimum price using the landed price logic above. Set your maximum price conservatively at first; you can widen the range once you've confirmed the strategy is behaving correctly.
The goal of this strategy isn't to aggressively undercut. It's to keep your MFN listing competitive within a defined margin band, without reacting to every FBA price move that doesn't actually affect your MFN Buy Box position.
Step 5: Add an MFN fallback rule (recommended)
When FBA competition is weak or absent, your FBA listing has room to hold a higher price. This is where a fallback rule protects you from unnecessary drops.
Configure a rule that says: if no FBA competitors are active on this ASIN, hold price at or near maximum. In Informed Repricer, this can be set as a conditional within the strategy (check your strategy's "when no competition is found" behavior and set it to raise price to max or hold current price, not drop to min).
For MFN, the equivalent fallback is: if the lowest MFN competitor is more than X% above your current price, raise toward max. This prevents your listing from sitting at a floor when there's no competitive pressure requiring it.
Step 6: QA test on 3-5 ASINs before full rollout
Pick 3-5 ASINs that represent your typical catalog mix: one with strong FBA competition, one with mostly MFN competitors, and one where both types are active.
For each ASIN, check:
- Does your FBA listing's price move in response to FBA competitor changes, not MFN ones?
- Does your MFN listing's floor reflect landed price, not just item price?
- When you check the strategy activity log in Informed Repricer, do the repricing triggers show the expected competitor type?
- Are your listings within your defined min/max range at all times?
If any of these fail, check the competitor targeting scope first. A wrong competition type setting is the most common cause of unexpected behavior.
Three rule templates you can copy
Template A: Strict FBA-first (FBA SKUs only)
- Strategy type: Match or beat lowest FBA competitor
- Prioritize FBA: Enabled
- Competition scope: FBA offers only
- Fallback (no FBA competition): Hold at current price or raise to max
- Min price: Covers COGS + FBA fee + referral fee + margin floor
- Max price: Target sell price at healthy margin
Template B: FBA-first with MFN awareness (FBA SKUs, mixed ASIN)
- Strategy type: Match lowest FBA; monitor MFN
- Prioritize FBA: Enabled
- If lowest MFN price drops below your FBA min: Hold FBA price, do not follow MFN down
- Min price: Same as Template A
- Max price: 15-20% above your typical FBA competitor range (allows headroom to recover after competitors exit)
Template C: MFN controlled adjustment (MFN SKUs)
- Strategy type: Competitive within margin band
- Competition scope: MFN offers
- Min price: Landed price floor (item + shipping cost)
- Max price: Set at 10-12% above your average MFN competitor's landed price
- Rule: Never price item below [COGS + shipping cost + referral fee + 8% margin]
- Fallback: If no active MFN competition, raise to max
Three scenarios and what to expect
Scenario A: An MFN competitor undercuts your FBA listing
A merchant-fulfilled seller drops to $19.99 on an ASIN where your FBA listing is at $22.50. With "Prioritize FBA" enabled and your competition scope set to FBA-only, your repricer ignores that MFN offer. Your price holds. Amazon's algorithm still favors FBA for Buy Box eligibility, so you often keep the Buy Box at the higher price. No race-to-the-bottom triggered.
Scenario B: No active FBA competition on the ASIN
Your FBA competitors have gone out of stock. With the fallback rule configured to raise price when no FBA competition is found, your listing moves toward max rather than staying at the competitive floor. This is the correct behavior. You recover margin while demand still exists. When FBA competitors return, the strategy auto-adjusts back down within your rules.
Scenario C: MFN shipping distorts the guardrail
Your MFN item price is $18.00 and you charge $5.99 shipping. Landed price: $23.99. A competitor's MFN listing shows an item price of $15.50 with $7.00 shipping. Their landed price is $22.50. If your repricer only compares item prices, it looks like you're winning. But the customer sees $23.99 vs $22.50, and the Buy Box goes to the competitor. Always confirm your repricer is comparing landed prices, not item prices in isolation, especially for MFN repricing scenarios.
Quick outcome checklist after initial setup:
- Buy Box win rate for FBA listings holds steady or improves within 24-48 hours
- MFN listings don't drop below landed-price floor
- No oscillation (prices bouncing rapidly up and down) in strategy activity logs
- Margin per unit on MFN SKUs is at or above your defined floor within the first week
Best practices and troubleshooting for mixed-fulfillment SKUs
Set conservative floors first. Start your min prices higher than you think you need to. You can always lower them after you've confirmed the strategy is working. Widening guardrails is easy. Recovering from a margin-destroying week of incorrect minimums is not.
Don't run the same strategy for FBA and MFN. Every time you're tempted to assign both fulfillment types to a single strategy, remember the landed price problem. The cost structure is different, the Buy Box algorithm treats them differently, and the competitive set is often different too. Separate strategies take ten extra minutes to configure and save a lot of headaches.
Prices oscillating? The most common cause is two competing repricers chasing each other with no floor check in place. Verify your min price is set correctly and that your competitor scope is appropriate. If you're competing against yourself (FBA strategy chasing an MFN listing on the same ASIN), that's a targeting configuration error.
MFN shipping skewing your guardrails? Double-check that your repricer is pulling live shipping rates from Seller Central and that those rates match your actual shipping charges. If you offer free shipping on MFN, your item price min needs to absorb the full shipping cost.
Prices not updating as expected? Check your strategy activity log in Informed Repricer. Each repricing event shows the trigger, the competitor offer it responded to, and the resulting price. If the log shows inactivity during a period when competitor prices were moving, check that the correct strategy is assigned to the affected SKUs.
Before you change any settings, ask yourself:
- What's my actual margin at the current price, after all fees and shipping?
- Which fulfillment type is my primary Buy Box path for this ASIN?
- Are my competitors primarily FBA, MFN, or a mix, and does my strategy reflect that?
FAQ: repricing FBA and MFN together
Does Informed Repricer treat FBA and MFN listings the same?
No. Informed Repricer's "Prioritize FBA Listings Over MFN" feature lets you configure fulfillment-specific targeting. FBA listings can be set to compete only against FBA offers, and MFN listings run on their own strategy with their own guardrails.
Will MFN repricing accidentally start price wars?
It can, if your MFN competition scope is too broad or your floor is set incorrectly. Limiting MFN repricing to a defined margin band (Template C above) prevents your listing from chasing every price move in the market. Informed Repricer's profit-focused algorithm is designed to find the highest price that still wins the Buy Box, not the lowest one.
How do I prevent MFN shipping from breaking my min price?
Set your minimum using the full landed price calculation: item price + shipping cost. If your repricer supports an "Additional Cost" field at the SKU level, add your outbound shipping cost there. This ensures the floor accounts for your real cost structure, not just the item price shown in the listing.
Can I run different strategies for different SKUs or conditions?
Yes. In Informed Repricer, you can assign different strategies by SKU, fulfillment type, or product condition. This is exactly the setup this guide recommends: one strategy for FBA SKUs, a separate one for MFN SKUs, each with appropriate guardrails. If you have questions about configuring this for your specific catalog, Informed Repricer's live chat support can walk you through the setup in real time.
Mixed-fulfillment repricing isn't complicated once your rules reflect how Amazon actually evaluates offers. Keep FBA and MFN strategies separate, build guardrails using landed price, and use the "Prioritize FBA" setting to make sure your FBA listings aren't chasing price drops they don't need to follow. From there, the repricer does the work. Your next step is to apply Templates A, B, or C from this guide to a small batch of SKUs, run through the QA checklist, and then roll out to the rest of your catalog.