Joe -

Plexiglass was bought at Home Depot. You can purchase a single sheet which measures 36 X 48 for $23.00 and cut it down (which I did to see how it would work) but then I ordered a 5 pack and that comes 32 X 40 for $79.97 (so $15.00 each) which you still have to cut off 2 inches, but alot cheaper and less waste. Hope that helps

BIGSTIG