Blue Man Group is an Off-Broadway show playing in New York City at the Astor Place Theatre. It is an extremely popular show that has been there since 1991. The Blue Man Group has become a sensation that now has several productions all over the world, but I believe the Off-Broadway location is one of the first ones.
Tickets for Blue Man Group are $75, or $65 for limited view seats. The theatre is really small, so no matter where you sit, you'll be able to see everything just fine. I actually purchased my ticket for $25. They sell student tickets 1 hour before the show, except for Friday and Saturday night performances. It was pretty crowded when I went, so I would recommend getting there a little earlier if you wish to purchase a $25 ticket.
I thought that the show was pretty entertaining, but I didn't love it as much as I thought I would. It is basically 3 men with blue paint on their heads doing all sorts of silly tricks. The audience really enjoyed it, and I can see how it is a worldwide sensation. The Blue Men don't speak at all, so it's easy for all people to understand what's going on.
While Blue Man Group is definitely fun, I don't know if it is worth $75.