The next best option if you don't have a local manufacturer or wholesaler is probably a decent sized sign maker. I was able to get several sheets of 4' x 8' 80-thou white styrene for my backdrops from our local sign maker at "trade price plus a beer" (in folding money), when he placed his next bulk order from the manufacturer. Plus ask for a look through their offcuts recycling bin as well. Amazing what you can find at scrap plastic prices.
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