Try doing an internet search on Piedmont plastics. They are one of the biggest distributors of it. It is hard to give you a price per sheet, as the price seems to vary quite a bit around the country. Also, you can typically get it in two colors (white or black) and in many sizes from 1/8" to 1/2" (and maybe thicker, but I have never seen any thicker). It will typically run about $28 to $120 a sheet.
Hope that helps,
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