Greenhouse kits are available in a wide range of costs and with a wide range of features. Prices range from a few hundred dollars to well over $5,000, depending upon the size, style, accessories, and type of construction materials. Manufacturers can be found in the yellow pages of a telephone book, in advertisements in gardening magazines, by searching the World Wide Web, or by contacting the Hobby Greenhouse Association (8 Glen Terrace, Bedford, MA 01730-2048). You can find the Hobby Greenhouse Association on the web by following this link. Compile a list of manufacturers, and request information on different models. Compare costs and features for the style and size you are interested in. Generally, plastic-covered greenhouses are easier to assemble than glass houses.