Palruf 26 in. x 8 ft. White PVC Roof Panel 101336 - The Home Depot
Amazon.com : Corrugated Plastic Sheet for Indoor and Outdoor Use - 4 Mm Thick Poster Board, 24x36 Inches - Pack of 2 White Plastic Board Sheets - Waterproof Coroplast Sheets and Lightweight
Corrugated Plastic Sheets, 8 x 12", White for $0.50 Online | The Packaging Company