As a matter of fact, I have a cd that I sell with hoigh quality scans. It sells for 15.00, and now has well over 11,000 scans, all done at 316x316 @ 200dpi. They're all exactly square scans, so work perfectly using them with thumbnail applications.
I still have a promotion going on at my www.HappyChipper.com website, where if you buy my Collector's Assistant Casino Chip & Memorabilia database program, I throw it in absolutely free. (yes, can you beleve it, I must be crazy!)