It's not a petstore convention, it's actually breeders. Picture aquabid sellers all together in a big room, but with reptiles.
I think you would LOVE a leopard gecko! They are precious, stay small, are good with handling, and are very hardy. They need a 10 or 20 gallon tank(or tub of equivalent size) and will happily eat crickets and mealworms! They come in a lot of colors and all have cute personalities!
Plus they won't be as stressed as something taken from the wild! They will have been born and raised. Also, be careful about state laws, some places don't like you to catch wild reptiles.