Don't ever, ever purchase anything at one of the airport kiosks unless you are in a desperate situation. I bought a pair of headphones once that broke right after the plane touched down for 12 dollars. The food is overpriced, the electronics and medication is overpriced, everything you could possibly have forgotten last-minute is overpriced. Before going to the airport, always bring a pair of headphones, any aspirin or mucinex or whatever you need, all of your chargers, etc. so you aren't stuck buying them at the last second from people who know they're preying on our forgetfulness.