It pulls your items from your Cafe Press shop and displays them in a vB3 page of its own. It shows item picture plus price. A member can click on it and be taken to the appropriate Cafe Press page to purchase the item.
use something like the free script from here. // basic store only, i didn't know you had an advanced store before posting this...
i am currently still using it in vb2, but it looks like a piece of cake to add it to a vb3 installation, either via vbacmps (as above) or via another page that allows you to parse template calls in, many how-tos around the site already.