Alright so, I want to build PVC cages (not racks, actually enclosures) for my bearded dragon, and one for my ball python. I want to use Controlled Density PVC (or something similar). I want my cages to be similar to the Animal Plastics T8 which is 4'x2'x1' , but I'm in kind of a money pinch so ive decided to try and build my own. So my questions are:

Has anybody built with this type of PVC before? If so, can I get it at a hardware store?
Is it expensive?
Does anyone have any photos of theirs? (I've looked on the Internet and couldn't find any good ones)

Any tips/helpful hints would be GREATLY appreciated.