Charon Cart Extension
Jules developed this cart for his own use but has decided to share it with everyone. He also made some nice documentation on the cart and you can download a zipfile with a complete ecommerce store demo.
The cart is in ASP/VBScript only and Jules states at his website that it's not really usefull for non-programmers. So just try it out yourself and see which one you like more: Charon Cart or UltraCart.