I don't know if they will be attending the same expo, but I recently got my first ball python from American Made Exotics.
I originally sent them an email to see if the available snakes on the site were all that were available, or if they had more that would be at the expo. I got a return email in less that a hour (this was at 10pm). Over the next 5 days I sent them at least 12 emails, all of which were answered nearly immediately. I was interested in three of the snakes, and they offered to bring them to the show so I could see them in person (also meant I didn't have to pay shipping). I did get my snake from them, he has been great, when I got home from the expo, the owner of American Made Exotics had emailed me and apologized that he didn't get to give me all the snakes info since he was busy with other customers. He ended up sending me the records of every meal he ever had plus every weight that had ever been taken while he was with the breeder. Because of this experience, I would highly recommend looking them up, or talking to them if they are at your expo. I know they go to a lot of expos on the east coast.