[H] Steam Keys [W] Steam Games or DLCs

Hello gamers! I am looking for steam games or DLCs for games that I already own. I have:

Iron Grip: Warlord
Section 8
Legendary
SpaceChem
Serious Sam HD: The First Encounter
Serious Sam HD: The Second Encounter
Serious Sam: The Random Encounter
Dream Pinball 3D
Insecticide
Tropico Trilogy
Serious Sam Double D
Imperium Romanum: Gold Edition