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Counter-Strike Global Offensive is a Steam Weekend deal at 33% off. In addition there’s a Free Weekend going on for the game. Play it all you want until Sunday.
Counter-Strike: Global Offensive = $9.99 / £7.99 / €9.34
BTW, the sale is to celebrate the release of GOTV and ESWC 2012 finals. HLTV is going to put up IPs at their site if you want to tune in.