If you search, you'll find first service prices ranged for FREE (depends on how you negotiated the sale) up to $600 depending on how hungry your dealer is. Mine was $110, fwiw.
Everything is negotiable, although I'd buy a GS-911 and learn to do some of the stuff yourself and reset the Service intervals in the computer every time you service it yourself. Only problems on you might have at the first service is getting the odd-designed castellated nut to tighten up the front fork bearings. You could make one yourself with a file and grinder if you search this site, but the socket isn't cheap either if you make your own vs. buying the $100 BMW one.
Or just buy a Ducati and get their bill and then wonder why your BMW was $700 cheaper.
Mack