From amazon.com

Half Life

The Half-Life Platinum Collection Second Edition is $29.99

It comes with Half-Life: Game of the Year Edition, Half-Life: Opposing Force, Team Fortress Classic and Half-Life: Counter-Strike and Half-Life: Blue Shift.

Half Life 2

The regular edition game is still around $49.99 and comes with Counter Strike Source which you can play as well as a team or set a team VS Bots scenario.

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