Another good way to make a hide for larger snakes is to get an appropriately sized cat litter box, flip it upside down, and cut a hole in the side of it just big enough for the snake to fit through...

As far as the vendors for shows: If Reptile Basics isn't listed, check to see if Cold-Blooded Novelties is listed. Rich, from RBI and Frank from CBN usually set-up together, and if Rich isn't there Frank will usually have a pile of RBI gear to sell. I'm just not sure if they go as far as Ohio...