I get mine from home depot and spray it with black undercoat. It comes in 72" X 36" X 5/32. It's in a slot next to the LEXAN and acrylic sheets; easily missed since all you can see is edges standing vertically. The website says it's in stock in Dallas (look up "Twinwall Plastic Sheet").
HD also has 48" X 96" "Plastic Cardboard" that is white cap on one side black on the other on their website which they will ship to the store for free - but it's the same problem; pack of 10. Maybe you can get other ecomodders in Dallas to go in with you?
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