Just had to replace the front discs and pads on my brothers 3.0i for the MOT.

Very surprised to see how cheap I got them for....£71.50 including the delivery.
I know it's not much use to our USA cousins but here is the eBay link.

BMW X5 E53 FRONT BRAKE DISCS AND PADS INC WEAR SENSOR 00-07 3.0i 3.0d 4.4i | eBay

I ordered them at 5pm and they were delivered at 10am the next morning.
Very happy.

Rog.