I bought new OEM pads for my IS300 mail order and since the disks (rotors) were smooth and there had not been any problems with pulsing, I just dressed them with a little Scotch Brite sanding pads and some elbow grease and then popped in the new pads. Disk brakes are easy to service and buying the set of pads for the front and rear was under $100.
I think this line about replacing the rotor is BS, unless they are too warped or grooved to be turned.