The question being where you can buy want at a lesser price than you have found rather than what you should buy--- I just purchased new rear pads and rotors. Along the way I took note of Cool carbon prices even though I was searching for best price on another brand I have on the front. I don't recall a price as good as you have found.

Check to see if AutoAnything carries the pads you want. I have a 15% of discount certificate I can PM you the code.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas