Upsell on Shopping Cart Page Adds the "Also Purchased" and Cross Sell boxes to the shopping cart page. For this module to work correcly, you will also need to have the Cross Sell Advanced module installed. You can find Cross Sell Advanced Here
We will be happy to install this module on your existing Zen Cart Shopping cart or as part of one of our shopping cart packages. This module is included with our Gold Shopping Cart Package.
Please know that this module is available for Free. You are paying for our time, knowledge and experience to install this on your shopping cart - the way you want it!