Many people choose to purchase a greenhouse because they provide fresh vegetables for many months as well as an early spring for your flowers. The ideal greenhouse will provide maximum sun exposure with a high degree of light diffusion, heat insulation and air circulation. Greenhouses are available in a number of styles, materials and sizes as well as the relatively new option of do-it-yourself greenhouse kits. A starter greenhouse kit will cost about $300 and will take about 20 minutes to set up however there are some styles of greenhouses which can cost up to $5000! Double-paned safety glass, polycarbonate and polyethylene are common materials for the walls and roofs of greenhouses, and aluminum, galvanized steel and resin are common materials for the sides and bases. Greenhouse prices vary significantly among suppliers, so when looking to purchase one of these products, it is best to shop around.