Shannon, Ireland, population 10,000, is a great jumping-off point for travelers heading to Limerick or the Cliffs of Moher. It’s also the birthplace of a $68.6 billion industry: duty-free shops.

Compare prices, be aware of exemption limits and follow the liquids rules to get the most from duty-free shopping. The maze of liquor bottles, cartons of cigarettes and cosmetics racks that you walk ...

For a lot of travelers, the best way to kill time during an airport layover is a shopping spree. But are the deals at duty-free shops really worthwhile? Zach Griff, an analyst at the travel website ...