I also noticed that you only find specially designed packages at DFSs around the world, like 3-pack scotch, cigarrette packs, etc. I believe I once bought a special 6-pack of Chivas Regal 12-year for very cheap.
Yes, buying anything at aiports is a rip off. Go to the McDonalds at the LAX int'l terminal and see the $5.99 Mcmeals.