Right now I have:
2.5 Ball Pythons
2.5 Leopard Geckos (various colours morphs)
2.2 Corn Snakes
0.1 Blood/Borneo Cross
I will be getting a pair of Desert King from the Gillards soon whoohoo.
As for cost my father breeds mice so food is free and I usually creat my own cages too keep costs down. When your collection gets bigger you have to get very creative to keep from going bankrupt.