Ryan,
I got my digital scale at Wal-Mart for like $35. They're over by the can openers and kitchen utensils...or at least they were when I got mine.
I will definitely be at the KC Herp Society show. I'm not sure what all I'll be putting on display...probably a few of my breeder Cresteds and some Carpet Pythons, but I'm not sure right now.
I should definitely have some geckos available there.
Here's a link for the show info...
http://kchs.drivennewmedia.com/fall_show_04.htm