We're looking for a cheap-to-free "off the shelf" ASP.NET catalogue application, that will meet the following requirements:

• Support two kinds of listings:
  • Suppliers of Services
  • Suppliers of Products, and their Products
• Suppliers can be categorised by:
  • Area of specialisation - including sub-categories
  • Location
  • Other data, e.g. where listing came from
• Versioning of supplier/product details
• Easy to use management interface
• Use masterpages so we can drop it into our existing site layout
• Run on a Windows 2003 server, with .NET 3.5 installed

In an ideal world, the following additional requirements might be met:

• Suppliers can manage their own listings

Other products that are available to us (that will obviously need some additional development to meet these requirements) are:

• Content Management System (MS)
• Commerce Server - bear in mind we're not selling the products/suppliers, just listing them
• Simple DB application.

I'm happy to knock something up in MCMS/simple DB, I'm just looking to see if anyone's had any experience with off the shelf apps that could save us some time.

I'm also happy to receive "Don't use this because" type answers.

Thanks.