Sale currently on for the game since a new update is out. It is free to download and play over the weekend too, so give it a go before you buy if you are not sure you will like it. Also, bear in mind that you can get the game as part of the Orange Box which also comes with the games: Half-Life 2 (plus episodes One and Two) and Portal - best I have seen this recently is for £11.73 at The Hut (£11.14 if you use Quidco) - [http://www.thehut.com/hut/8631188.product
Team Fortress® 2 (TF2) is the sequel to the game that put class-based, multiplayer team warfare on the map. This year's most anticipated online action game, TF2 delivers new gametypes, a signature art style powered by Valve's next generation animation technology, persistent player statistics, and more.
Unlike other "class-based" games that offer a variety of combat classes only, Team Fortress 2 packs a wild variety of classes which provide a broad range of tactical abilities and personalities, and lend themselves to a variety of player skills.
Play as the flame-throwing Pyro, the room clearing Heavy, or the Spy, a master of disguises. Other classes include: Scout, Sniper, Medic, Engineer, Demoman, or Soldier.