Trine 1 -75%
Trine 2 -75%
Trine 2: Goblin Menace -75%
Trine Complete Edition -75%
Alan Wake Collector's Edition -50%
Alan Wake's American Nightmare -50%
Rochard -75%
Legend of Grimrock
from here, Autumn Seal.
You might want to try your luck to get coupons. Remember, they are not game and they are for Steam.