Falken Design Multiwall Polycarbonate Sheet, Greenhouse Cover Sheet, Clear, 7" x 7" x 8mm": Amazon.com: Industrial & Scientific
8mm X 48" X 144" Clear Twinwall Polycarbonate Sheet at ePlastics
Ejoy 48 in. L x 24 in. W x 0.31 in.Thickness Corrugated Polycarbonate Plastic Clear Twin Wall Roofing Panel (Set of 24-Piece) TwinWall_TWPSC48x24_8mm_24pc - The Home Depot