PLASKOLITE 18 in. x 24 in. Corrugated Plastic Sheet 1TW1824C - The Home Depot
Corrugated Polypropylene | Fluted PP Sheet
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
White 4mm Corrugated Plastic Sheet (24" x 18") for indoor an
48" x 24" Corrugated Plastic Sheets - Short Flute White - USCutter
Juvale 8-pack Corrugated Plastic Yard Signs, 24x36 Poster Board For Garage And Estate Sale, Open House, Arts & Crafts, 4mm Thick Sheets Blank Surface : Target
Amazon.com : Corrugated Plastic Sheet for Indoor and Outdoor Use - 3/16 Inch Thick Poster Board, 24x36 Inches - Pack of 5 White Plastic Board Sheets - Waterproof Coroplast Sheets and Lightweight