They are cheap because they are made of 1/8" ABS plastic sheet instead of 1/2 inc PVC which is pretty standard for cages in this industry.
Now ABS plastic works well for crested geckos, gargoyles etc however for animal that requires heat, it will not keep heat the way PVC does. additionally you would still want at least 1/4 inch for the species I previously mentioned.
So unless you plan to keep your colubrid in a room that is heated at 85 and use ambient heat alone I would not recommend it.
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