I know they had rats last time I was there, but I'll check the list again.
All I remember from the reptile expo was lots of snakes, and my sister got a gecko there.
The only BP I remember seeing was a bumblebee. But I know they had a LOT of boids, so I'd be in luck finding one there.
The prices at the expo are pretty cheap also. I was so tempted to buy one of the beardies that were $10 because of a tail nip.