i bought a little speaker docking thing for my mp3 player, and it works great.....but the stupid thing runs on aaa batteries, and eats them like candy. it has a jack on the rear for some kind of power adaptor, but it didnt come with one. the instructions read:

"this unit can also work with a dc 6v power adaptor [not included]"

anyone know anything about them? where can i get one? how much are they? are there different adaptor ends i need to know about, or do all 6v dc apators have the same end? it looks like a standard round power adaptor end, just really tiny.