From VFLGS: Deluxe Runequest (2 sets in 1 box), Dragonquest 1st edition, Dragonlance module set DL1-DL15, Bunches of Shadowrun, Call of Cthulhu, Vampire, Werwolf, Rifts, Battletech, Cyberpunk & Babylon Project supplements and adventures. All of these were reduced about 50% + they gave a 20% discount if you spent over $200.
Local hobby shops: Loads of Rolemaster/MERP, Star Wars, Torg, Call of Cthulhu, Ars Magica, and others. They were trying to reduce stock and were giving a 20% discount on marked items, after two years they still had too much stuff and everything went to 50%.
Library Sale: My dad picked up a copy of WFRP he was thinking about buying. I snatched it out of his hands and yelled "MINE." This cost $0.50.
EBAY, many, many, many things. Most notable: $7 copy of Cthulhu/ELric DDG.
--BRAD