Welcome to BP.net! Great to see you doing research before picking up your Ball Python. My bit of advice for a first time buyer at a reptile expo is to go in with a plan, and a budget. Walk the show floor looking at every table before you handle any animal. Narrow down your choices to a manageable number, then go back and talk to the exhibitor. Ask lots of questions. Breeders generally love to talk about the animals they have for sale. Resellers and flippers generally don't want to have you ask too many questions. Just something to keep in mind. Good Luck!