I bought mine here:
http://www.a1electric.com/
I think the price was either $239 or $269 and they just bolt in place of your stock regulators (with the exception of running the wires through your door jambs). Takes a little time to run the wiring for the switches. I mounted my switches over the stock hole in the door panel for the window crank. Covered it perfect, can't even tell there was a hole there.