Grainger, eBay and the United States Plastic Corporation sell PVC plastic sheets. United States Plastic Corporation is a Google Trusted store featuring sheets from 24-by-48 inches to 48-by-96 inches, and from 1/8 inch to 1/2 inch thick.
Grainger sells clear PVC plastic sheets online and in its 350 branch stores throughout the United States and Puerto Rico. Grainger offers a wider selection than other stores, with more than 60 PVC type 1 sheeting products. Sizes start at 12-by-24 inches.
A wide selection of PVC plastic sheets is also available on eBay, with multiple sellers offering sizes starting at 12-by-12 inches. Most products have a set price, but some sellers take the best offer, as of 2015.