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Although it is the easiest oil/filter change I have ever done on any car, if you want/must to have it done for you, ask in your local MINI Club for a recommendation to an Independant Garage that knows MINI's.
Here is a directory for NAM's Regional Sub-Forums and here is a directory of local clubs. (choose "display by County/State")
I too live in Pasadena in an apartment that doesn't allow any car maintenance, so I also have to pay to get mine done. I just do it at the dealer so I can get a loaner for the day. Either that or drive way out of the way to do it myself which isn't worth the time.
Assael MINI. Just call ahead of time (like a month ahead) and schedule a loaner. Though... a friend with an R53 can only seem to get their craptastic Enterprise rentals, dunno.