Need a download/store/membership or similar script

Me and a friend wanna make a site selling graphic stuff. Flash stuff, PSD logos, the occasional vBulletin skin etc but can't figure out the best kinda script to use.

We've tried ZenCart and CubeCart but they don't seem right.

Something like what are being used on vBskinworks.com, vBmode.com, forummonkeys.com etc would be best. Also, free is much better too

Anyone have any recommendations? Thanks