Exercise caution in duty free shops

Not everything in duty-free is a bargain, says Janice Mosher, director of the Customer Service Center for U.S. Customs. If you really want that bottle of perfume, find out what it costs in your local department store first And consider the three ounce rule when stocking up on things like alcohol and olive oil.If you are transferring to another domestic flight after clearing customs in the U.S., you will have to put your liquid duty free purchases in a checked bag, Mosher says.