Select 2 titles for $15:
Spec Op: The Line
Lego Batman 2
Binary Domain
Civ V Game of the Year Edition
Warhammer 40k Space Marine
Serious Sam 3 Deluxe BFE Edition (includes Serious Sam 3: BFE, Serious Sam Classic: First Encounter and Serious Sam Classic: Second Encounter)
All are Steam copies except for Lego Batman 2.
Edit: Looks like they ran out of keys for Gods & Kings and have replaced it with Binary Domain.
Civ V GotY + Civ V God & Kings is a good deal if you haven't already picked it up.