Click the left link in my sig for the existing Duty Free thread in DiningBuzz.

At one stage, a Duty Free forum was approved for FlyerTalk, but never happened.

Please add a new post for each new notable deal wherever you travel and I'll add it to the index.
There are sections for various whiskys. Let us know the deals on JW Blue, too as it's a popular barometer.
Convert to USD (use xe.com if you like) for easier comparison.

Have you checked out the FT Travel Destinations > India section?

It would be interesting to see how the current deals in DEL compare to those in other spots.

Cheers,
BB