Plug-in Needed: E-commerce With Separate User Acccounts

I am trying to design a site that will be primarily be an e-commerce site where individuals who want to sell items on the site can creat an account and add items to the store, perhaps even their own page or category or “booth” within the greater show. Something along the lines of etsy.com, for example.

Can anyone recommend a plug-in that will make that possible?

Thanks in advance for your help!