Helicopter, Balloon, Sailing, Water.
I just eordered tickets to The Dark Knight Rises on way.com. I'm not sure how long this will last, but right now the movie tickets start at $7.20, but IMAX is $10.80. The movie tickets here are like $20 each, so I was able to save a ton of money.
When you order make sure to enter your ticket information so you don't have to wait for their email, and then email them back, etc.
Make sure to check this site, look for the theater that is 1570. That is the only one that's really worth watching it in IMAX on.