ORIGINAL: beau0090_99
Instead of buying a power supply, if you have any soldering skills, check out some of the PC power supply conversions that have been done. I asked a coworker for one (he is an egghead), and he gave me a 250W power supply. I just took the cable and found out what connections to short, and which ones to make into + and - leads and within about an hour, I had a supply that will give me nearly 20A of 12v DC power for my charger(s).
Curtis
Here is a good How-to on converting a PC power supply for use in our hobby. I've got 6 or 7 of these floating around my shop that I use all the time. I own a computer shop, so I've got plenty of supplys laying around to work with. If you need a supply stop by a computer shop and ask them if they have any power supplies from dead computers. Explain what you need it for and there's a good chance you'll pick it up for free, or for very little money. Of if you have a computer that dies, salvage the power supply out of (if it's still working of course) before you toss the computer.
[link]http://www.marcee.org/Articles/PCPowerSupply.htm[/link]
Ken