I set up Open Cart for a customer (same theory as Lex's PrestaShop suggestion). You do need to be self hosted though. Plenty to choose from with PrestaShop, AbanteCart, Open Cart and Zen Cart being the big boys.

Main site is Xara with a link to the store installed in a sub directory of the main site.

Hop onto YouTube and search for each name to see if any appeal to you.