If you're considering the purchase of an air bed, Sleep Number by Select Comfort is possibly the best known and most reliable choice for your purchase. The company has 478 retail stores across the continent, 24-hour phone support, a full website and a 20-year limited warranty. Because of these features and their quality levels, Select Comfort is generally recognized as representing the premier national air bed brand. Keep reading for a helpful review of the Sleep Number mattress features, mattressfabricfactory different models and where you can buy this innovative product. Features of the Sleep Number Air BedThe main selling point that attracts customers to the Sleep Number air bed is the remote controlled firmness settings. Each sleeper is able to control the firmness on their own side of the bed, inflating and deflating their individual air chambers at will.Basically, the bed works because it has two separate air bladders in the air bed. Sleep Number settings then mean that when a sleeper increases their sleep number, the bed inflates with air and increases in firmness. When a sleeper decreases their sleep number, the bed deflates. A person must, however, be lying on the bed while adjusting the air level so the firmness can take into account your weight and size.The mattress is then covered in a high-quality Belgian Damask fabric quilted in a plush, pillow top style. Different Air Bed ModelsThe Sleep Number Bed comes in 6 different models - the Sleep Number 3000, 4000, 5000, 6000, 7000 and 9000.The Sleep Number 3000 is the company's basic model. The key differences between it and higher level models are mattress height, materials, pillow-top inclusion and the fabric used to cover the mattress. PriceA basic, twin air bed Sleep Number model will cost a mere $450. However, the King-sized Sleep Number 9000 will set you back approximately $600 to $4700 depending on accessories. Most purchasers will find the cost of the upper end models a bit too high for a bed.Retail and Online LocationsYou can buy a Select Comfort Sleep Number bed online at selectcomfort.com, the company's website. From their site, you can even apply and qualify for term financing, allowing you to pay down the cost of your air mattress over several months or years. Phone orders can also be placed through the website and catalog system by calling 1-888-411-2188. Alternatively, customers can also purchase an air bed at one of Select Comfort's 478 stores across Canada and the United States. Visiting a bricks-and-mortar retail location allows you to try out the bed for yourself and even see inside an air bed. Sleep Number stores also sell a wide variety of air bed accessories, like pillows, bedding and other customized products. Before you buy, take note that despite the company's promise to take the mattress and bed set back within a month if you're not happy with it, the responsibility for footing the cost of the return rests in your wallet. The cost of a shipment that large will be fairly sizable.