Since I was just there on my way to Germany, I thought I would let you all know what I found in terms of bourbon. I bought a 1l bottle of Wild Turkey 101 8-year for $21, which I understand is export-only. They also had regular WT Rare Breed, Woodford Reserve, and white-label Jim Beam. This was the duty-free shop on Concourse C, but I doubt that the one on D has much more (if it does, sucks for me).

Completely unrelated, but they had my favorite cognac, Martell Cordon Bleu, for a little over $70 (best price I've seen).

Anyway, I hope this helps someone.