what you want for half life 2?
anything from here? http://steamcommunity.com/tradeoffer/new/?partner=82833940&token=4OQ3Vrp8

one for episode one:

Steam Gifts:

Sleeping Dogs: Nightmare in North Point
Dead Island: Epidemic

Steam Keys:

Dead Space
Deadlight
Galactic Arms Race
The Cat Lady

Origin Keys:

Medal of Honor

I have to offer:

9.03m
3 stars of destiny
LightFish
Hacker Evolution Duality
Galactic Civilizations II: Ultimate Edition
Ballpoint Universe - Infinite
Power-Up
Just Cause
Orcs must Die 2
Thief Gold
Memories of a vagabond
Jet Gunner
Bad Hotel
Hammerwatch
Lilly Looking Through
The Cat Lady
Circuits
Borealis
Huntsman: The Orphanage
Major Mayhem
Canyon Capers
Battlepaths
Electronic Super Joy: Groove City

I'm looking for HL2 episode one