I got my pads and rotors from
Auto Brake Parts - Rotors, Pads, Drums, Shoes at Wholesale Prices. Call Sam and tell him sean Gilley sent you and maybe he will be able to give you a good deal.
The OEM rotors can be turned if there is enough metal so they aren't below the minimum thickness. I turned all of my sedan rotors and the Brembo rotors from my coupe.
It isn't necessary to turn the rotors when changing to new pads, but al ot of times it is recommended. It depends on the condition of the rotors.