Humble Bundle offers Steam downloads of its Humble Firaxis 4-Game Bundle for whatever you want to pay. If you opt to pay the bare minimum of $1, you'll get XCOM: Enemy Unknown, Sid Meier's Pirates!, Ace Patrol Bundle, and Sid Meier's Civilization III Complete. That's $41 under the lowest price we could find for these games purchased separately elsewhere.

If you pay more than the average, currently $9.35, you'll also get Sid Meier's Civilization IV Complete, Sid Meier's Civilization V, Sid Meier's Starships, XCOM: Enemy Unknown Elite Soldier Pack, and XCOM: Enemy Unknown Slingshot Pack. Finally, pay $15 or more to also bag Sid Meier's Civilization: Beyond Earth, Sid Meier's Civilization: Beyond Earth Exoplanets Map Pack, and a discount for 33% off Sid Meier's Civilization: Beyond Earth Rising Tide DLC. Your contribution can be donated to charity (Firaxis and Action Against Hunger USA), the developers, or both. Deal ends February 2.