I've been using an online search tool for a few months and think you all would likely find it useful as well. Winesearcher (free) and Winesearcher Pro (subscription) are useful not just for finding wine, but also for finding whiskey, since most stores that index their wine inventory with Winesearcher also index their liquor.
So, you can use Winesearcher to find out what the best price is nationally for a given bottle of whiskey, or to find which store in your area carries it. (But keep in mind that not all wine shops or liquor stores index their inventory with Winesearcher.) For running searches for whiskey or other liquor just enter ALL in the Vintage field, and include the age of the whiskey in the name field. So, you might run a search for "Pappy Van Winkle 20." Also keep in mind that not all stores use the full name in their inventory, so "Van Winkle 20" might be a better bet.
The URL is http://www.wine-searcher.com/
I think the Pro version is invaluable, since it shows many more shops. But the basic free version can be useful too. (This is not an advertisement - I have no affiliation with them other than as a satisfied customer.)