Duty Free Balvenie 21 Portwood
Dr. Spencer - If I'm not mistaken the duty free bottling, rather bottling at higher ABV and non-chill filtered, is a bottling relegated to duty free shops in certain markets. I know it is/was in different Asian markets. Thus, your only chance of getting it near L.A. would be at LAX if you were traveling out of the country and could buy it was for sale in the duty free shop. Or perhaps you might have a friend returning from Taiwan and might find it in duty free on their way home?.
This is not an unusual means of brand building while attempting to match a limited supply with an unknown demand. It also helps determine what the market's interest is, will bear, and whether or not there's enough of both to increase supply for a future and broader distribution. Johnnie Walker green label was originally released and only available in duty free shops in Europe. And there are many other examples.