Cheap tickets are roughly $45 ($70 for good ones). We're not completely sold on it yet, given that it's a big venue and, while I'm a Killers fan, we're pretty much lukewarm on the rest.
Reply with either:
A.) How awesome the other bands are in concert, and we should really go!
B.) You want to go to the concert, and we should come with you!
C.) Dude, don't waste your time.
ETA: D.) Monkeys!