Rubber-Cal Neoprene 1/4-in T x 4-in W x 36-in L Black Commercial 60A Durometer Rubber Sheet in the Rubber Sheets & Rolls department at Lowes.com
Amazon.com: Foam Insulation Neoprene Sheets with Adhesive,Multi-Function Soundproof Large Marine Closed Cell Neoprene Rubber Roll (W:12 Inch T:1/8 Inch L:59 Inch,Black) : Industrial & Scientific
Sponge Neoprene Foam Rubber Sheet with Adhesive, 12 in x 60 in x 1/2 in Multi-Function Soundproof High Density Waterproof Rubber Mat, Perfect Cosplay Easy Cut DIY Neoprene Padding Roll - Black:
Amazon.com: NATGAI Sponge Neoprene Without Adhesive Foam Rubber Sheet, Cut to Multiple Dimensions and Lengths - DIY, Gaskets, Cosplay, Costume, Crafts (1/4" Thick x 13" Wide x 80" Long) : Arts, Crafts