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Makey Makey $49.95
My daughter and I used this to build a horsetail-grass and papyrus drum machine, and you can too! Turns any conductive object into a potential switch, uses no special drivers, the MaKey MaKey simply appears to your computer as the arrow keys, mouse click, spacebar, and other keys simply by plunging it in.
Technivorm Moccamaster. There is no substitute.