A little shocking that brake parts can be this spendy, but I guess when the car cost somebody the better part of $100K..
Rear pads were maybe $200, but pads AND rotors (+1 sensor) for the front like $1200
Super easy repair. I went to dealer for parts, but I like that they have record of factory M parts purchases and repairs to go along with this car to support the records if/when I trade or sell on.