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There is not much to be had at airports in Tokyo or Frankfurt, and the vast Copenhagen duty-free shop is more expensive than most. Paris offers bargains in women's handbags, and Moscow sells pasteurized fresh caviar in 4-oz. jars for $4.61. Hong Kong is in a category by itself. At Kai Tak Airport, American cigarettes sell for a record low $1.75 per carton, and whisky is bought up briskly by Japanese travelers for prices a fraction of those at home. Even so, in a city that might be called the biggest duty-free shop in the world, liquor and tobacco are about the only goods that are not sold duty-free.