Weekend deals from Valve via Steam

When you make a good game and you keep supporting it, you can keep selling it many years after you've released it.
Weekend Deal: All Things Counter-strike - 50% Off

This weekend only, pick up Counter-Strike Games and save 50%.
The deal applies to:

Counter-Strike - Now just $4.99.
Counter-Strike Source - Now just $9.99.
Counter-Strike Complete - Now just $14.99.

Offer ends August 11th.