or you can get real dirt cheap. Get a battery, a lamp or an LED, and a resistor (so the light doesnt burn out), a coat hanger, an eye screw, dowel, a shoe box and some wire.
bend the coat hanger to any shape you want. You will be passing the hanger through the eye screw. stick the ends of the coat hanger in a shoe box. The eye screw is attached to the dowel so you can hold on to it better. Basically your objective is to make sure the eye screw does NOT touch the coat hanger. If it does, then the light goes on and then you lose.
Make sure you are using an uncoated metal coat hanger, or it wont work.