[mitch808]

Centric rotors
Centric brake pad sensor, only one needed up front and one in rear.
Brake pads of choice. I also bought centric.

All in I think front and year was under $400 in parts. It's been a while. Anyone that buys from an online bmw specialty shop is often getting ripped off by a large margin. Brakes are a high margin business.

It takes me around 30-45min per axle to do the job. No special tools needed.

Rotors do NOT have to be replaced with the pads. I usually replace them every other pad replacement. A proper bedding of the pads, of scuffing of the old rotor is all you need to do.