Toggle relay?

One of the things I am interested in doing is home automation. I've had no problems finding relays with 5v coils capable of switching 120v @ up to 10A, but they require that you constantly supply current to maintain the state. While this is well within the capabilities of the arduino, relay driver, and relay itself, it becomes a problem when I want to use portable power in hard to reach places. I think I need a "toggle relay" but the results I get aren't exactly what I am looking for, and the ones I do see are $25+. Does anyone know of a supplier that is more affordable, or know the proper term for me to search for? I'm looking to buy about 40 and there is no way I can afford $25/ea.

"latching relay"