You can buy tickets at the door, although there is always a line, no matter what time you show up. Here are the details:
April 23-25, 2009
University of New Mexico Arena ("The Pit")
Avenida Cesar Chavez Blvd. SE (Hwy. 25, exit #223)
Albuquerque, New Mexico, USA
I will say it is crowded and can be loud. We found it best to get there early, claim our seats and spend most of the time sitting and watching, too hard to get up and walk around the crowds.
Simply amazing. I wish we could be there this year.