What are some of the most expensive Scotch Whiskeys?

Some of the more familiar brands include Laphroaig, Glenlivet and Glenfiddich, all very good and a bit pricey. But the best Scotches are either not exported at all or only in tiny quantities. Owners of high-end bars around teh world often fly to Scotland to purchase the best (and most expensive) whiskeys, which can only be found at the source.