FBA and FBM offers do not compete on equal terms

Pricing a seller-fulfilled offer as if it were an FBA one is the fastest way to lose either the sale or the margin, depending on which direction you get it wrong.

An FBA offer and a seller-fulfilled one do not compete on equal terms: they differ in delivery promise, in fee structure and in how Amazon weighs them for the featured offer. Comparing them on price alone hides that. SellerFlow computes the real cost of each channel separately, so the two are compared on what they actually leave.

Two channels, two cost structures, two different floors

An FBA offer pays Amazon's fulfilment fee and nothing else to move the unit. A seller-fulfilled offer pays a carrier, plus handling and packing. Those are different numbers, they move for different reasons, and they produce different break-even points for the same product.

A repricer that uses one cost for both will price one channel too low and the other too high.

The delivery promise is the other half

Amazon's own comparison weighs how fast the buyer gets the parcel. A seller-fulfilled offer delivering in four days usually has to be cheaper to compete with a next-day Prime offer, and an offer that delivers faster than the competition can often hold a higher price.

SellerFlow reads the fulfilment channel and the delivery promise of every competing offer, so the price it sets reflects the position the offer actually occupies.

Real shipping cost, not an average

The cost of a seller-fulfilled parcel is not one number. It depends on weight, destination and which carrier ends up moving it. SellerFlow derives it from your actual shipments and carrier invoices, so the floor under a self-fulfilled price is what shipping really costs rather than a catalogue-wide average.

Which channel is worth it, per product

Because both channels are costed with the same discipline, the profitability of each can be compared per product. Sometimes the answer is that a product only works in one of them — and knowing which is a purchasing decision as much as a pricing one.

Frequently asked questions

Should I price FBA and FBM offers the same?

Usually not, because they do not cost the same and they do not convert the same. FBA carries fulfilment fees and a delivery promise you do not control; FBM carries carrier cost you do control. The right price for each comes from its own cost floor, not from matching the other.

Is FBM ever more profitable than FBA?

It can be, particularly on heavier or slower-moving items where fulfilment fees are high relative to price. Deciding it needs the real carrier cost rather than an estimate, which is why shipping cost has to feed the margin calculation. It depends on real weight and real carrier cost, so the comparison is only as good as those two inputs.

How does the delivery promise affect an FBM offer?

It affects both conversion and the featured offer. A seller-fulfilled offer with a slow promised date competes against an FBA offer that arrives sooner, and no price cut fully compensates for that. Choosing the carrier that meets the promise at the lowest cost is part of the pricing decision, not separate from it.

Last updated: 2026-08-19