Pololu 4095 12V, 4.5A Step-Down Voltage Regulator D36V50F12 -...
Pololu sells these for $39.95 each. New, left over from an Arduino project. Takes an input voltage from 13.3V to 50V and outputs 12V, up to 4.5A continuous. Cash only. ** IF YOU SEE THIS AD, IT'S...