Just got a notice from my pal Bill that Chevy Chase Inn will have 10, 12, and 15 y.o. Pappy Van Winkle for tomorrow.
Their Happy Hour deal is as follows: Whatever you have in front of you at 5:30, you get a free one. Pitcher, glass of wine, glass of beer, anything. The exception is the very high priced bourbons like Pappy, where you get the second at 50% off. So lots of folks will trade their discounted shot with someone so as to get to try multiples. As a bonus, their liquor pours are quite generous.
In any case, this is a prime shot to try one of the world's most precious bourbons. You can Google to see what it brings on the secondary market. In my experience, most bars never get a bottle.