http://store.steampowered.com/sub/12075/
Steam Daily Deal is(offer ends after ~9 hours):
Gothic Complete Pack 12.49€(G1, GII Gold, G3, G3 FG, ArcaniA, ArcaniA: Fall of Setarrif)
Gothic Universe Edition 4.99€(G1, GII Gold, G3)
Or every game(except G1) -75%