If you are not to concerned about SE Friendly, and just require something to show off and promote your store items, and also don't mind paying I recommend sothink in particular >
http://www.sothink.com/product/javascriptwebscroller/samples/amazonstyle/amazonstyle.htm
Very adaptable, and if your good at coding you can load stuff in a whole host of ways, it can even create Widgets, so just one line of code to add....
Also there is a free trial to test...