Vision cage prices at reptile expos?

In November (14th-15th) I am visiting the Arizona reptile expo to purchase some decorations for my snakes, and MAYBE a new BP, though, I don't know if my mom wants to have another snake in the house. For my female normal BP, she is housed in a 20 gallon glass enclosure. She is getting pretty big now, and by November she will definitely need a new enclosure. Now, I see the vision cage model 400 costs like $200 dollars or so, but I can't afford that at the moment. How much would that enclosure be at a reptile expo? I'm hoping it will be much lower than $200 because I really don't want to pay over $100 just for a 40 gallon glass enclosure. Yes, that is very pricey for a 40 gallon, but that's what I have to pay. It's what I paid for my King snake, so I guess it's what I have to pay for my Ball python. Anyways, How much would that enclosure be at a reptile expo? I'm very much interested in purchasing one.:D