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
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 Plastic cardboard 0.157-in T x 24-in W x 36-in L White Corrugated Plastic Sheet in the Polycarbonate & Acrylic Sheets department at Lowes.com
Coroplast 48 in. x 96 in. x 0.157 in. (4mm) White Corrugated Twinwall Plastic Sheet CP4896S - The Home Depot
Clear Mini Profile Corrugated PVC Roofing Sheets – TG Supplies – Your #1 Supplier of Polycarbonate Sheets and Pergolas
4mm Corrugated plastic sheets : 12 x 18 :10 Pack 100% Virgin White