Does anyone have a source for 4-6 inch acrylic pipe at decent prices? I know where I can get it in 10 foot lengths, but I don't want that much. Or if anyone else would like to go in on a purchase together I'd be willing to do that.
PVC won't work?
Otherwise I would suggest letting your fingers do the walking and call all the plastics dealers in the phone book. They may have scraps also. If yo tell them exactly what it is for they may even keep an eye out for scraps for you.
I can check here in Cleveland, but adding shipping to you may make it prohibitive.