There are two main drop shipping source channels for Amazon:

1. Amazon self-operated: Amazon self-operated means that Amazon works directly with brands or suppliers and uses its own warehouses and logistics to store and ship products. In this way, Amazon will purchase products at wholesale prices and then sell them at its own selling prices.

2. Third-party sellers: Amazon also allows third-party sellers to sell products through the Amazon platform. These sellers can choose their own shipping methods, including using their own warehouses and logistics to store and ship products, or choose to use Amazon's FBA (Amazon-operated logistics) service to let Amazon help store and ship products. Third-party sellers can set up their own stores through the Amazon platform and use the sales tools and services provided by Amazon to promote sales.