Sperry Instruments CS550A Circuit Breaker Finder $16.04
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Not a good price
Found this while I was looking at the GFCI tester thread
Sperry makes the job of locating electrical circuits (AC circuits of 110-125 volts) quick and easy. Turning off the correct breaker is critical when considering work on an electrical circuit and can take an excessive amount of time using "trial and error" until you hit the right one. This Circuit Breaker Finder features a sending unit which you plug into a receptacle in the room where you want to work and a receiving unit which you use to test the breakers to correctly identify the right breaker every time