Before i go to a show i try to stop and tell myself i'm only going to look or i'm only going to buy " Insert herp". I try to make sure i have a spare cage at home up and running before i go just incase i do bring home something new.
As said above, if you buy something they usually have them placed in deli cups and from my experince the breeders don't mind placing the animal "under the table" until your ready to leave, as long as you pay them then.
I buy a few supplies at expo's because they are normaly cheaper so even if i don't buy reptiles i'm bringing home something new.
1.2 Bearded dragons (Login, Raven, & Jean Grey) 1.1.1 Corn snakes(Havoc,Sable, & Kink0 1.5 Leo's (Psyloke (Lucky-male) Speedball, Domino, Rouge, Siren, Elektra) 1.0 Veiled Chams (Neo), 0.1 Rose Hair T. (Night Crawler) 0.0.3 Crested Geckos (Shiva, Storm, Beast) 0.2 Kenyan Sand Boas (Tigra & Cloak)