The Home Depot, Menard's, Amazon.com and Wal-Mart are some stores that sell freestanding carport kits. The carport kits are available in a wide range of price points, depending on the unit's size and construction material.
The Home Depot has many different models and styles of freestanding carports for sale. Available options range from small, inexpensive canvas-top models to large fully enclosed canvas-, fiberglass- and vinyl-coated steel units. The Home Depot stocks carports from several different brands, including Caravan Sports, King Canopy, Moto Shade, Shelter Logic and Versa Tube. Selections start with units such as the Caravan Sports 10-foot by 20-foot Domain Carport for under $100 and range up to carports costing nearly $3,000, as of 2015.
Menard's offers many of the same style and sizes of freestanding carports as The Home Depot, including an expanded selection of Shelter Logic models with models large enough to accommodate most recreational vehicles and farm equipment. Large models range in price between $5,000 and $15,000.
Amazon.com has similar styles as the other suppliers of freestanding carports, with models available from Arrow, Abba Patio, Shade Tree and Duramax. Wal-Mart offers most of the standard brands and styles and also carries clear polycarbonate arched-roof products made by Palram.