Just get one of the larger plastic cages from companies like Boahile Plastics, which in my opinion and experience is by far the best.
Here's the link... www.boaphile.com go to Cages
For a little more than $200 you can have an excellent, light weight, durable, modern, easy to clean, spacious 4 foot long plastic cage built by a master carpenter who happens to be one of the best boa breeders out there. Definately worth it in my opinion.. nothing to think about.
You can save only a few dollars with some other companies, but receive cages far lesser quality. Worst part is, you won't realize this initially.. it'll come to light some time down the road - when it's already too late.
Some other classic cage companies/styles for single cages are Vision Cages, Neodesha, and Freedom Breeder, among many others.
Take care, Joe Rollo - BciJoe
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Thanks and take care - Joe Rollo
'Tis not the stongest of the species that will eventually survive, nor the most intelligent, but the one most responsive to change' Charles Darwin