Have ALIEN vs. PREDATOR (fps as either a predator, marine or alien - rrp 39.99) - Want offers

AvP has been on sale for $3.74 before.

Is it a key because its not in your inventory and it showed you played it you cant trade games that you ahve already played or in your game library.

i have 2 copies - i purchased one for myself and one for my brother, but the game wont run on my computer so im going to trade a copy..

I have activated one and played it, but the other is in my inventory..

I havnt seen it on sale for $3.74 before, this is my first steam trade so im new to this :) please be kind

I should be able to trade the other copy since i purchased it as a gift but havnt used it yet

Oddworld Munch Oddysee, Greed Corp or Splinter Cell Conviction DLC?