Zelsius Replacement Panel Set for Greenhouse 04, Hollow Chamber Sheets Made of Polycarbonate, Greenhouse Panels, Double Skin Sheets 6 mm : Amazon.de: Garden
Amazon.com : Be Cool Solutions Polycarbonate Panel, Twin Layer 4mm Sheet, 1 Pack, 2' (W) X 4' (L) - Cold-Flexible, Clear, Strong Impact and Shatterproof - All-Weather Outdoor Garden and Greenhouse Covering :