Now, you might want to visit http://www.vstore.com
It's a free service where you get to pick your own items to sell and you use their free tools to setup a store with all the items you want to sell, under your own store, and you get some commission from each item you sell.
Does anyone know of anymore such stores? VStore is only accepting US-based vendors, and not anywhere else.
Even Amazon.com doesn't allow you to setup a free store and let you choose the items you wanna sell, all under 1 roof.
(I think you gotta pay for those Amazon zShops)