Hey Craig,
Not sure if you are just trading or buying as well. If you buying here is a link to my Unisquare store. I have a good selection of 52 and 53 topps cards and am working on adding others years over the next couple month (48 bowman is next). Hoping to have 1000 cards listed in the next couple of months.
http://www.unisquare.com/store/clozipone/
Good luck with you quest
Chris