Blu-ray supports both 23.976 and 24 but the majority of blu-rays are encoded at 23.976 so that 3:2 pulldown can be applied to maintain compatibility with NTSC.
You beat me to it, GameOn
! I think I only have maybe two or three movies in my collection encoded at 24fps. Off the top of my head, the only one I can remember for certain is the UK Cine Asia release of Jackie Chan's Little Big Soldier.