An internet search for 'plastics suppliers' in your area should give you some options. Laird Plastics in Spokane looks promising.
I build some PVC stuff (racks and stands) but I won't build enclosures since I can buy far better ones premade for less than I can make them for. I haven't purchased sheet PVC since the before times, but then I was paying $110 a sheet (12mm). I'm pretty sure it isn't any cheaper now.
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