We always just dealt with a local acrylic/plastic supplier/fabricator. Kind of place sells plastics/acrylic sheets/tubes and does custom displays and acrylic fabrication.
They always seemed to have loose cut offs of 2-6” acrylic tubes laying around they wanted to get rid of, just paid their cut charge to get it cut to length on bigger stuff we couldn’t handle on table saw and they would price it just above wholesale just to rid of it. Many times got pieces that had slight scuffs in it at damaged goods pricing. Check around if your in more urban area, you might be surprised what you can find cheap.
Clears way to go so you can see what’s going on no doubt.