48" x 24" Corrugated Plastic Sheets - Short Flute White - USCutter
12x18 4mm Corrugated Plastic Sheets 100 Pack White Waterproof Lightweight, Blank Boards Double Sided for Lawn Signs, Garage Sales and Real State. Various Sizes, Colors by WholesaleArtsFrames-com - Walmart.com
Coroplast Board - White - 1/4 inch thick - various sizes – Falken Design