Ejoy 48 in. L x 24 in. W x 0.16 in.Thickness Corrugated Polycarbonate Plastic Clear Twin Wall Roofing Panel (Set of 36-Piece) TwinWall_TWPSC48x24_4mm_36pc - The Home Depot
Amazon.com: Polycarbonate Greenhouse Cover 4mm - Clear 24" x 48" (Pak of 5) : Patio, Lawn & Garden