A successful product array can include variations on a theme. Consider smaller or larger versions of your existing products. For example, the Mag-Lite flashlight comes in sizes ranging from a keychain model to one comparable in size to a policeman's truncheon. By offering a variety of options, you increase the number of potential buyers in two ways: You can reach people who wouldn't have considered buying your original product but who like the variations, and you can turn a single purchase into multiple purchases.
Excerpted from 303 Marketing Tips: Guaranteed To Boost Your Business