It's cheap and genuine BMW. You may want to pick it up at the dealer to avoid the shipping charge.

http://www.ecstuning.com/BMW-E70-X5-N52_3.0L/ES193655/
Keep your brake pads silent with this anti-squeal paste from Genuine BMW.
Apply this paste to the backs of rotors, guide pins, caliper slides, and all other moving parts to keep everything in your braking system quiet and protected from corrosion.