Just my two cents.
Price is not the only thing to check about a game.
A game on Steam may have different versions, or may not be available for purchase. It depends on the game and the store.
I have a tradeable copy of the game, which actually is this Sleeping Dogs.
As you can see, my version of the game is not available on the DE (German) and RU (Russian) stores
because these stores sell the LV (low violence) version or the version with DE and RU languages only.
Sleeping Dogs (LV DE)
Sleeping Dogs RU version tagged internally only (does not show on description).
You can browse all available versions of the game here: Sleeping Dogs versions
So if I understand what you said, you have the Sleeping Dogs EU version.
I'm from Italy so I have no problems of restricions.
My point was not to tell you that I have an unrestricted version.
My point was to tell you to watch out for the game version you purchase.
I am from EU too, and we DO have problems with restrictions (depending on the restrictions ofc).
I know the current price of Sleeping Dogs is 3 TF2 Keys, I know.
I just wanna know if someone want to trade the game for 2 TF2 Keys only.
Sleeping Dogs -> 2 TF2 Keys