Just found this promotion - only a few days left:
Seal-tastic sales for Alan Wake, Legend of Grimrock, Rochard and the Trine seriesFinnish game developers Frozenbyte, Remedy Entertainment, Recoil Games and Almost Human have announced Autumn Seal, a pre-holiday promotion full of great discounts on awesome games. This is a Fall Season themed slot machine with a bunch of seals having a good time. All participants can receive developer specific Steam coupons when they hit three of a kind on the machine. The slot machine can be played infinitely with only a timed limit of ten spins per five minutes. The campaign website will be available for a limited time only (until they run out of coupons) and all coupons have an expiration date of Nov. 20th 2012.
The following games are available in the campaign: Alan Wake and Alan Wake's American Nightmare (50% off), Legend of Grimrock (50% off), Rochard (75% off), Trine, Trine 2, Trine Complete Collection (75% off), and Trine 2: Goblin Menace (50% off).
Text: http://www.gamershell.com/news_145715.html
Play for the codes: http://www.autumnseal.com/
Good luck :)
graylox
17.11.2012
PS: I was lucky, with the first run I got the only game I didn't own before.