Shopping cart that allows for custom productID in URL to Buy it Now

I'm now looking into the option of using a shopping cart into an
existing static built e-commerce site. I have a script that will
create the html pages from a database as opposed to database driven
server-side. This is what leads to my request for the shopping cart:

When an item is added, say based on the model/sku #.. The URL for
"Add to Cart" must contain the model/sku somewhere in that. This way
I can use my script and add the appropriate buy it now link based on
the model # from my database. ex:
http://www.test12345.com/cgi-bin/sho...oductid=model#

The 'view cart' links I assume can be the same on all pages but what I
don't want is a random cart generated product ID for each item.

Another few requests, first one more important to me:

** A cart that will allow the import of model #/Price/shipping price &
perhaps description from Excel spreadsheet.
* I still want orders & order info e-mailed as opposed to the need for
checking a remote site

Anyone know of a basic cart (without the site creation and management
tools) that will do the above? I really only want to use the cart for
customer convenience. I will handle the links from existing webpage.
Will be willing to go to Unix or NT hosting account. In fact if
anyone has a cart that will do these things and offers hosting, will
go that route.

Thanks in advance!