To get back to the viv question!
This tread has turned out a bit HARSH! I think, but thats not for me to reason on...
Anycase...
If your looking for a cheap viv, heres an idea.
Build one yourself! Easy enough, unless your really bad with your hands, hehe!
Just take 5 pieces of wood of good sizes to create a viv of (Don know inces so..) about 1m length, 40cm high and 50/40cm deep. Slap them together and give it a glass or perspex front.
Then you can choose to have a opening lid or opening glass panel.
This is how I'm doing mine and the glass front panel opening is better since the snake won't stress out as much when coming in from the top the whole time!
Really not hard!
Just remember to put ventilation on the sides and back (drill a couple of small holes)
You can even glue and screw the sides together!
If you do this neatly your snake will even have less chance to escape since everything should fit snugly onto everything else!
Hope it helps!