Wait until you pass the security check point prior to purchasing anything. Sounds like obvious knowledge as they WILL force you to throw out the water you just purchased, but for some reason I forget this EVERY time I'm in an airport. I guess that's what you get for resorting to water in Vegas in the first place. I mean what is this? Utah? But other than that this place has all the crap you'll need to get through your waiting and flight with exceptionally high prices. 9 dollar magazines, 6 dollar waters, 3 dollar bags of nuts, and, can I get a happy ending at least?