In the next few days, airports nationwide will be flooded with travelers en route to see family or friends for the Christmas weekend, and many of them may be shopping at the increasingly popular terminal electronics stores. Travelers often look to replace headphones and chargers, while some might be hoping to pick up last-minute forgotten gifts. But how much will it cost you to buy electronics at the airport? dealnews investigated by gathering data from five different airports — and we discovered that you could be paying 34% more than you should.