Important to note that plenty of other companies will carry the inventory and ship goods out for you (Amazon did not invent the concept of third party logistics

Important to note that plenty of other companies will carry the inventory and ship goods out for you (Amazon did not invent the concept of third party logistics) - however if you go to a third party warehouse it is difficult to get certified as 'Prime'. (Seller Fulfilled Prime is a thing, but in reality is currently closed for sign-up and is really only for the large sellers)