Luke, the teasing never ends with you! Now I guess I have to bring a wad of cash with me for more than just beer and scotch...
While I love White Plume Mountain, Keep on the Borderlands, and the Oasis of the White Palm (and have, in fact, used bits or all of them in my 3.X and 4E games at one time or another, my all-time favorite modules are full of silliness: Dungeonland and The Land Beyond the Magic Mirror. But speaking of the classics, I actually found a copy of G1: Steading of the Hill Giant Chief at 1/2 Price Books a few months ago for $7, and it was in pretty-darn-good condition, too! I'd never seen it by itself before.
