Fulfilment and fees
What is FBM?
Also known as Fulfilled by Merchant
FBM means the seller stores, packs and ships their own orders rather than using Amazon's warehouses. Amazon still handles the transaction and charges a referral fee, but no fulfilment fee.
Why it matters
FBM avoids fulfilment and storage fees, which can make it the better economics for large, heavy or slow-moving items where FBA fees would consume the margin.
The trade-off is Prime eligibility and the conversion advantage that carries, plus full responsibility for shipping speed and customer service — both of which feed your account health metrics.