I always look at it this way; There are two types of breeders in this game, those that are in it for the money, and those that are in it for the animals. A Reptile Expo generally allows you to see both types.
Now, this is not to say that a poor show display or containment means that the breeder doesn't care. That stuff is expensive to acquire, but most of these animals go into those containers for the weekend and don't come back out until they get "home". Be that a new home, or back to their rack tubs.
I always buy from someone that has happy, healthy animals, and I try to buy from the smaller guys over the bigger ones.
Hopefully you found some nice animals.
Best,
Paul