[H]HL2 and L4D2 cards [W]Cheap game(s)

Hello everyone!

I have the following Steam Trading Cards in my possession:

Half-life 2:
Gordon Freeman,
Gordon & Alyx,
Respite,
Trouble Underground

Left 4 Dead 2:
Boomer x2,
Charger,
Jockey

I would like to trade either one set (4 cards of the same game) for one cheap game, or both sets for either two cheap games or one little more expensive game. If you offer games in the form of keys (instead of Steam tradeable copies), please say so.

These games are the ones I am looking for, though you can offer other games:
They Bleed Pixels,
Resonance,
Company of Heroes,
Bastion,
Puzzle Agent,
Costume Quest,
Hotline Miami,
Proteus,
Dear Esther,
Wanderlust Rebirth