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Compare game prices. Buy You... and who else? PC in retail box or cd key. Activate You... and who else? on official platforms such as Steam. You... and who else? cheapest price.
You... and who else?
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Use your CD key on Steam to download your game.
You... and who else?
For Steam CD Keys, you must download (HERE), install the Steam software and create a new account. If you already have a Steam account, once you log in, click "Add a game" (located in the bottom left corner), and then "Activate a Product on Steam". After a few more clicks, you will be prompted to type in your game code. Thus, the game will be activated and automatically added to your account library.