Plugin for ecommerce with multiple users

Hello,
I am looking for a plugin(s) that would allow visitors to subscribe to the site, post products for sale that can be bought directly from the site.

Basically I think that I would need the functionalities of the following plugins combined together.
http://staypress.com/
http://buddypress.com
http://getshopped.org/

Anyone knows any plugin that would cover these feature?
Thanks!