You know, if you have an extra regular computer power supply laying around, you can use the 12v output as your power source. You can get a current model new for as low as $25-$30 that will supply from 15A to 25A. You'd have to do a little modification for your use, but that's pretty cheap and the output is pretty high. I had an old unused car CD player so I built a case with speakers to put it in for a workshop radio using a PC power supply and it works well. Just another suggestion... :)