Recently,i played the PC game:Team Fortress 2 in my friend’ home.I think this game is very interesting.

Nine unique character classes, each providing a completely unique play experience for players of varying skills
Advanced graphics that offers a unique game environment while providing game information within the visuals
New multiplayer game modes with support for up to 24 players
Includes support for voice chat
No need to look for patches or new content with the automatic update feature 

Now I want to buy this game,but the price of the game is expensive,so i want to buy it on sale website.Today, i saw this game is sold cheaply on popvoucher.Can you tell me another website,I want to compare them.

Might be a bit late, but you could just buy it off Steam. You know, where it is sold for direct download...from Valve...the creators of the game and Steam...