AspxCommerce offers a complete ecommerce solution that allows you to run your fully functional online store in minutes. Create your storefront; manage the products through categories and subcategories, accept payments through credit cards and ship them. We have set up everything for you; just focus on building your online store. Most importantly, since it’s open source, it is available for free!! 

Just visithttp://www.aspxcommerce.com/

http://demo.aspxcommerce.com/

http://aspxcommerce.codeplex.com/