FBA and FBM have different types of fulfillment costs. With FBA, you pay Amazon for services such as storing and fulfilling your products. The amount can vary based on factors such as product size, weight, and how long inventory is stored. 

With FBM, you manage your own fulfillment costs. These can include warehouse or storage costs, packaging, shipping, labor, and returns.

This means there is no simple answer to which option is cheaper. A product that is profitable with FBA may not have the same margins with FBM, and vice versa. The best approach is to calculate the total cost for both methods before making a decision. Amazon’s Revenue Calculator can be used to compare FBA with your own fulfillment costs. 

Read our complete Amazon FBA vs. FBM guide to understand the other factors you should consider.