It's not exactly a sale, but I couldn't think of a better place to put this.
Yesterday I wandered into an EBGames here in Melbourne, and saw they had Planescape: Torment on the shelf... http://i40.tinypic.com/ouy3rs.jpg. Meanwhile, GOG http://www.gog.com/gamecard/planescape_torment, as the standard price. In those terms, GOG's normal price is still a 66% discount on what I could get it for from a brick'n'mortar shop

.
For comparison, Mass Effect 1 was $19.15, and older games are usually about the $20 mark. So maybe it was a typo, but it'd be odd for that to get onto the shelf.