Expanded PVC | Lightweight Rigid Foam Sheets I SF-Plastic-&-Sign-Supply
Amazon.com: Mega Format Expanded PVC Plastic Sheets - 12" X 12" Rigid White Sheet for Crafts, Signage, & Displays - Sintra, Celtec PVC Board - Waterproof for Outdoors Use - 1/4" 6mm
0.040" x 48" x 96" White Expanded PVC Sheet | U.S. Plastic Corp.