I went this weekend and I went to ones in Tampa and Orlando earlier. There are usually several booths selling tarantulas and scorpions. I picked up my first P. murinas (OBT) there this weekend for $10. A tiny little spiderling. I also got a Grammostola pulchripes and a Avicularia avicularia for a friend. In Tampa earlier this year, I picked up a Venezualan suntiger (P. iminia), a Mexican redleg(B. emilia), a Mexican fireleg (B. boehmei), and a Costa Rican tigerrump (Cyclosternum fasciatum), all spiderlings. Of course there are some selling large wild caught spiders and things they claim are new to the hobby, but I try to stay away from those. You never know what you'll get there.
The people from Exotic Kingdom and Nature's Wonders seem like good people who know what's going on with their tarantulas.