(Disclosure: This site contains product affiliate links. We may receive a commission if you make a purchase after clicking on one of these links. Read our affiliate disclosure for more info.)
Valve sale going on at GameStop. Save up to 75% off. All the games are going to require Steam activation.
Counter-Strike: Global Offensive = $7.49
Counter-Strike Complete = $7.49
Day of Defeat: Source = $4
The Orange Box = $8
Portal 2 = $12
Left 4 Dead = $8
Left 4 Dead 2 = $8
Half-Life Complete = $16