Well, I don't buy the same expression of Scotch twice (so many to choose from, and I'm gonna live only so long!) but if I did, it would be the Aberlour 12, a lovely sherried expression that's always on sale my my local bottle shop for the sainted-from-heav'n-above price of $29.99 (USD).
I've been known to buy Don Julio Anejo tequila more than once, but only because 1) it's freakin' delicious, and 2) it's the best tequila I've found worth buying even once. Most tequilas aren't worth buying once (y'see, I'm a sipper, not a mixer).

