I use a very simple shopping cart for my clients - very easy to design around, they use include files for everything - so all you have to do is design your site and drop in the include files. Oh Yea this shopping cart is in classic ASP.
The shopping cart works really well, and no I am not affiliated with the company in any way just thought I would share it with everyone.
http://www.ecommercetemplates.com/ They have several templates for Frontapge, dreamweaver, etc.
If you want to use your own design purchase the Generic version.
http://www.ecommercetemplates.com/help/design.asp shows how simple it is.
Here are a few sites that I have running the Cart :
Ignore this domain, I just put togather another sample site, took about 2 hrs to lay this design out and implement the cart.
http://www.realtysitesonline.com/index.asp
http://www.jerseyfiresafety.com/
http://www.carolinafirstaidandsafety.com/ ( still working on this one )
http://www.markatcc.com/
Let me know if you use the cart and what you think. If you do use it and need any help, please feel free to ask for it.
All the Best,
McKenzie