You might just want to get it on board. Remember that you get a 10% discount as 1K. I think they have Chivas and/or Dewars 12 year old. Also Johnnie blue label for about $100 if you want a major peace offering.

IAD duty free seems to be reasonably priced and has a decent selection. Beefeater gin is only $14 for a liter.

I am annoyed that UA no longer sells gin duty free. They used to sell Bombay for $20 on board. Now the only have over-priced Grey Goose vodka.