Other people already gave you some good advices.

One more here.
Since you are so excited..keep in mind you dont need to buy the first snake you see at the show. Look around until you see "the one".

Also, consider getting a female. If one day you decide to get another ball python (even a morph) you will be able to breed them sooner, since you will have a good start on the female already.

Good luck and have a good time at the show.