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Valve has announced that those who conduct the pre-purchase of Counter-Strike: Global Offensive on Steam can play a week earlier.
The launch is scheduled for August 21, but with the pre-purchase, they can begin to play from August 14. In addition, pre-purchase entitles you to a discount of 10 percent in the total price. So, spend 9.89 instead of 10.99.
If you are willing to spend a little longer, for 14.27 can buy the complete collection Counter-Strike, which already includes Counter-Strike: Global Offensive.