All of my cages are made by Animal Plastics. I use their T8 cage for Ball pythons. They cost $150 plus shipping and any add ons that you choose. They are very sturdy and worth the money. You can even stack them.
2 cages stacked
This is a T8
Here is their website: http://www.animalplastics.com/
And once again the thread I wrote on animal plastic cages (and PVC cages in general): http://ball-pythons.net/forums/showt...With-Pictures!