Right now you can relive a couple of classic strategy games. The Humble Store has Age of Empires III: Complete Collection on sale for $9.99 as part of their Spring Sale. The Complete Collection includes all of the expansions.
Fans of the series can also pick up Age of Empires II: HD Edition for $4.99. This all includes all of the expansions. The sale ends in 24 hours.
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Both games are delivered via Steam. A free Steam account is required.