Polyethylene film (plastic sheeting) is the most economical choice. While it lasts only 3–4 years, it’s much cheaper upfront than polycarbonate or glass.
Sylviera 6x7.5ft Outdoor Walk-in Greenhouse, Heavy-Duty Polycarbonate Greenhouse with Reinforced Aluminum Frame for Garden, Backyard, and Winter Walmart - Sylviera Go to product viewer dialog for this item. buy cheap greenhouse
For those wanting a more permanent feel, this kit uses rigid polycarbonate panels and a reinforced aluminum frame to better withstand wind and snow compared to soft covers. Miracle-Gro Mini Greenhouse Wayfair& more Go to product viewer dialog for this item. Polyethylene film (plastic sheeting) is the most economical