It's even worse: many of the alcohol products for sale at duty free are exclusive to duty free, thus preventing any price comparison. They market this as an adv

It's even worse: many of the alcohol products for sale at duty free are exclusive to duty free, thus preventing any price comparison. They market this as an advantage (get a whisky you can't get anywhere else!) but at least in the world of Scotch, they're mostly no-age-statement "luxury" whiskies with far more brand than substance.