Reptile expos sell a lot of good stuff, atleast the 3 different ones that i've been to. You can usually pick up some stuff for good prices. You can find snakes, equipment, tanks. Just make sure to bring a bit of cash with you.
I have never been to the SC expo, but I believe one of the ones that they hold are the venomous reptile show. Different vendors will have BP's for sale, just make sure its a more reknown vendor, and ask as many questions as you can think of, because if they get aggrivated with your questions then obviously they didn't want your business.
I wouldn't buy from LLLreptile if they are there.