I haven't read your other threads so forgive me if I'm mistaken about info you have already shared - but I get the impression your snake is a male BP. If he is currently in an enclosure that's too small, you might look into setting him up in a large plastic tub. Even the biggest tubs are cheap, and fantastic for maintaining proper temp and humidity. That way you could provide him with more room while you save up for a PVC enclosure.
Almost every reputable PVC enclosure maker is absolutely hammered with orders, and while the supply chain for materials will gradually open up as the Covid situation resolves over the next year or so, I don't think you will ever really see a fast turnaround time for a good PVC. So settle in, do your research and planning and saving, and eventually order an enclosure that you can be sure will comfortably accommodate your snake. It is absolutely worth the wait, and in the meantime tub enclosures can be really excellent.