They can get up to 7' in length but most of the ones I've seen tend to max out between 4 and 5'. An adult would need a minimum of a 24" cube (24x24x24)
I would encourage you to go with something other than a glass cage (as you have stated in other posts). First, glass cages typically do not meet the vertical height requirement needed by an arboreal species. Second, it is significantly more difficult to maintain the correct ventilation and humidity levels in a glass tank. Lastly, ATBs are very alert and aware animals - being in a glass box with people and potentially other animals strolling by could be asking for stress related eating and shedding problems.
Several cage manufacturers, Reptile Basics, Repti-Racks, Boaphile, etc. make ABS/PVC/HDPE cages especially designed for arboreal species. It is also possible to buy a plastic Rubbermaid, Sterilite, Iris or even Container Store tub that is dimensionally suitable to an ATB.
If you opt for a cage, it's going to set you back at least $150 for a PVC model, considerable less for a tub. Getting the proper temperature gradient, enclosure furniture, temperature control equipment etc. will cost probably an additional $100 or so. In other words, I think your budget is on the low side.









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