For the OP:
A major supplier of Lexan and Acrylic sheets in the East half of the U.S. is/was Cadillac Plastics. They go by some different names today but the original name still links to them using the Cadillac Plastics name on the Internet. Google them as there are several in Georgia to choose from. Phone calls are cheap or free!
I don't know what area of Georgia you live in but one can't be that far from you. Here, they will custom cut to order or sell you the whole sheet. I used them a lot to get the clear plastic of abut any thickness including blocks when I had my business as we'd use the clear plastic cut up and glued together to mockup prototype models for demostrations and presentations of various concepts. They also go by different names in parts of the western U.S. but I see it's still named Cadillac Plastics in Seattle.
BTW, that's where most of the retailers get their sheet plastic supplies anyway and then mark them up for a profit. The local places I've been using now are just very close (a couple miles) and have all I need so I don't have to drive the 32 Miles to our area Cadillac Plastics in Grand Rapids just for a sheet or two.
