Wow, only $500 for parts AND labor? I priced out the parts from one of the BMW OEM sites and they came to $450 or in that neighborhood.

I went to the tire guy today and told him the story. I'm going to bring him the car on Monday and he's going to "try" to determine which one may be defective. The service guy at BMW did mention to me that one of the tires (I believe it was rear/left) had an usual amount of weights on it. If I were a betting man, I'd say that's the defective one.