Hello:
I converted the original IBuySpy store to a complete commerce module, and extended it to include a completely integrated checkout process, order tracking, and administration capabilities.
The module only lacks Shipping integration with any of the major shippers.
At this time, the module is being sold on Snowcovered.com ... but if it doesn't sell shortly, I personally would love to contribute it to this project (as that was my intent in the first place). The module completely implements the DNN DAL, and uses sophisticated dispatcher pattern found in other modules like DNNForge by Scott McCoullough.
In order to contribute this though, I will have to check with my partner.
A complete working DNN2.x version of this module is on my site. The module has also been converted to DNN 3.x including friendly URL's, integrates multiple images per item, is completely internationalized in English and Chinese, paypal payment and a bunch of other great features. This was not a trivial effort, so please don't treat this post as such.
http://aciasoftware.com/Default.aspx?tabid=184