This a great charger for the money
http://www.electricwingman.com/skyrc...e-charger.aspx
I know it's not a dual charger but at that price you could buy 2 for the price of a dual charger. I currently run 2 of these...
http://www.electricwingman.com/imax-...e-charger.aspx
I got a 30A power supply from bigred ( Carl Latham)that powers them just fine, I'm sure he sells the chargers too, if you send him a pm then I'm sure he'll be able to help you out.