I heard about this sport a couple years ago. It sounds very similar to Wheelchair Football, which I played in college. Like rugby, murderball is a little more violent than we played.
Anyhow, they made a documentary about the U.S. para Olympic team and it's in theaters now.
Murderball is currently playing in only a few cities, so I'm almost certain we won't get it around here. I've never traveled to another city for a movie, but I might make an exception.