I was in the same position as you less than a week ago....
I bought a 12v 3A power supply from dick smiths for while I was at home, plugs into mains power and has a cigarette lighter socket outlet... $60.
I also just yesterday bought a Car Jump-starter from Supercheap auto. Its 12v 17Ah battery, rechargeable from mains socket, it has a cigarette lighter socket 12v outlet... Runs the mount perfectly in places where you dont have access to mains power. Cost me $85..
Both work fine, although the dick smiths power supply says on the box in fairly big letters, "FOR INDOOR USE ONLY" where as the battery pack is in a sealed plastic box... I think its a safer option really.
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