After a bit of guessing and hunting, I found you can get the prices (albiet in Eur) from the Spanish BMW web
http://www.bmw.es/es/es/owners/servi...alculator.html.
5 year 100k is Eur 10.600 or about $14.2k.
In some parts of the world, I understand the price is negotiatable off the price list and the salesman is getting an incentive.
As for the pricing for M5, I noticed the prices were between 4-6x the cost of same coverage on my 135i -- M5 MSRP being only about 2.5x the MSRP of my 135i. Someone explained that its the cost of the special consumables for M5 ie brake pads etc being factored in but I have never seen someone price out the full maint schedule for 100k-kms.