Do some research on some of the breeders that will be there and try to find out some information on them.

The reason I say this is because what seems like a good deal, maybe isn't. You can find a list of what breeders will be there from the website, atleast sometimes you can, but definately do some research on who will be there, and keep that in your notepad so you don't buy from a breeder that has a reall bad reputation for having unhealthy animals and such, i.e. LLLreptile.