Here is where I got mine....
:: Brakeworld ::
I put the PowerDisc slotted rotors on the Aero and REALLY liked them. I have since changed the front to C32 rotors(drilled) and calipers with the PowerDisc still in back.
I also bought a set of Xbrake drilled & slotted rotors for my Dodge Intrepid to test them out. They work very good.
They list a Premium OEM at what looks like a decent price....