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You could try making one with an old doorbell or some other kind of button, all you would need is a spring, some wire, a little aluminum foil and a soldering iron. Run the wire across the diameter of the button, soldering each end to a small piece of foil, and fastening the foil with more solder or superglue or whatever. Then, position some more small pieces of foil where you would like the button to make contact on whatever casing you're using, running leads from the contact points. Run the leads into the case and connect them to the power switch header pins (or optionally, splicing them into the existing power switch wires, so either switch can be used).