I think the idea is that the BMW near me charges over $100 for a full synthetic oil change...if you're not going to do this stuff yourself...find a QUALIFIED mechanic to do it. If you can find one outside of a dealership, even better, due to the fact that BMW charges $100/hr for labor and marks up their parts like 700%.
If you are not going to do this stuff yourself...get familiar with the various BMW parts websites, so you can at least buy the parts at a reaosnable price and then have them installed.
In order to not get ripped off its gonna take either the time to learn how to do the stuff on your own, or the time to research the best place to get it done (which we all know is no easy task).
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