I have been fortunate enough to stumble across an ad in the New Times for an independent BMW-Certified tech. He has a 10-year background with BMW dealerships including Long Beach BMW and Camelback BMW here in the valley. He is in the beginning phase of opening his own shop, but for now he offers valleywide mobile service and works out of his home garage. He does excellent work and his prices are awesome. If anyone is interested, info below:

New Dimensions Automotive
2927 E. Hermosa Vista Dr.
Mesa, AZ 85213
Jaime Tejeda

Tell him Aaron sent you and he'll hook you up. I just got control arms & bushings installed for $150.00, and he adjusted my side windows and trunk latch for free!