Ecwid

Ecwid is an AJAX application that allows you to add an online store to an existing site or page on a social network. Ecwid works on the SaaS model: users manage products and categories on the web server and place the widget code with an adaptive design on their page.
Ecwid’s WebPartner Program is designed specifically for developers, agencies, designers and anyone who builds websites for a living.
Preferred access to new features
Access beta products, preview new releases, author guest blogs, tap into Ecwid's global partner community, and help influence Ecwid's product roadmap.
Ecwid enables a quick and seamless addition of an online store to any web presence. You add stores to any site you build, charge for your services and get an extra kickback from Ecwid.