Tuftex SeaCoaster 2.2-ft x 8-ft Corrugated White PVC Plastic Roof Panel in the Roof Panels department at Lowes.com
18x24 4mm Corrugated Plastic Sheets 100 Pack Green Waterproof Lightweight, Blank Boards Double Sided for Lawn Signs, Garage Sales and Real State. Various Sizes, Colors by WholesaleArtsFrames-com - Walmart.com
4mm Corrugated plastic sheets: 24 X 48 : 100% Virgin White Pad