Here's the secret to those good deals on Ebay.... those sellers are losing money. And the competition is fierce. Ask me how I know!
Anyone can buy wholesale from a manufacturer if they have a sales tax certificate. You can get that from your state and local government. Annual fees are involved.
But it is hard to find a sales rep that will even talk to you if you tell them you're selling on ebay. Once you do get an account, your first order usually has to be about $1000 depending on the company you're dealing with, then there's a minimum per order after that.