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You can find moderately priced audio components at Super Stores like Wal-Mart and Kmart. Some department stores also sell audio components. Often, super stores and department stores tend to sell bundles equipment, a receiver packaged with speakers and a DVD/CD player, for instance. Buying bundled equipment is usually a good value, but you are giving up the ability to choose each component of your system.
Electronics specialty stores have an excellent selection of audio equipment. National chains like Best Buy and Circuit City tend to have a good range of prices and brands. Local and regional electronics specialty stores often have a range of brands, including higher end brands.
There are a number of online retailers that specialize in audio equipment. The advantage of online audio equipment etailers is selection. The online audio equipment etailers tend to carry many brands and models of receivers. Two of the better known audio equipment etailers are Crutchfield.com and 6Ave.com.