A joystick is an input device consisting of a stick that pivots on a base and reports its angle or direction to the device it is controlling.http://en.wikipedia.org/wiki/Joystick
Joysticks are used primarily for video games, but are also used for flight simulators. They are also present in machinery such as cranes. Mini versions exist in cell phones as a means of navigation.
For mobility impaired individuals, a joystick can be used in electric wheelchairs as a way to steer it.
Somewhere between $50 to $240. Its all about the quality and the durability. Other factors can include the store you purchase it at, the features it has, and if there are any special connections that need to be created.
A good website to purchase one: http://www.p3america.com/industrial_joystick_selection_guide.htm?gclid=CITf4a6Rq7ACFeEDQAodT0svSQ
From the site above, I would have to pick Model 890, fully customizable joystick. I would say that this is the best out of all of them. It is customizable for any scenario, has many features, and it is heavy duty, so you know that it will be with you for a long time.external image X5wKGn0MUlLCAx9yJnlv2DfLC-8pIAqNjZBVp-iQ2VbEB6TyLG8ELIgkRp10p-hUTTZBaQF-LwnQo8FN5-YZcu9kwGtaVlXDgPlqw5_9AswUXqXSwnc