The cost of opening a store on Amazon varies depending on different plans and services. The basic fee includes a professional seller plan fee of $39.99 per month and a commission for each sale. In addition, you may also need to pay storage fees, delivery fees, and advertising fees. The specific fees depend on the product category, sales volume, and services selected. In addition, there are other fees such as return processing fees, long-term storage fees, etc. It is recommended to understand Amazon's fee structure in detail before opening a store and make decisions based on your business needs.