Carbon12,
I replaced mine with a piece of Lexan polycarbonate from a plastics dealer. I told them what thickness and tint and they sold me a rough-cut slab along with the proper jig saw blade for cutting the stuff.
Most plastic dealers carry the stuff in different colors as well as clear.
Regular plexiglas is too soft. Lexan is basically the stuff airplane windshields are made of. I paid less than $100 last year for mine.
Ed
