Do you have any AC - DC wall adapters? They would work if you could figure out some way to connect to them. Pretty much any wall adapter will do, I know most are unregulated, so you will be providing as high as ~17Vdc when you first connect them (for a ~12V adapter, that is), but the voltage will come down rapidly as the load increases.
EDIT: Or you could do something like Arinoth suggests, just get a 9V battery and power them up.
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