Koslov
I have some 1/2" Lexan on hand. I don't have a lot, largest chunk is roughly 5" x 6" rough edges but is pretty well square.
Still has most of the paper still on it, but may have just a few scratches. Not enough to allow a great deal of testing, but should sure enough do for one block. I'll ship it to you no charge, as I got it for the same price.
