For what its worth, I priced it out last year on RealOEM, let me get you the part numbers.
You have Nav right? So you don't need the CD player piece. I'll PM them to you, and for what its worth, I would order from the dealer online,
www.thebmwpartstore.com in Ohio is a dealership that sells cheaper than Tischer, with more reasonable shipping prices, and obviously tax free since out of state. My local dealer wouldn't touch the prices I get from them.