Get XCOM, Pirates, and Civ for cheap!
Holy shit holy shit holy shit, XCOM 2 is out next month. It's a follow up to the sublime strategy reboot by Firaxis with 2012's XCOM Enemy Unknown, which is one of the highlights of the Firaxis Humble Bundle. You can get it, and prep for saving the world in XCOM 2 for as little as a dollar.
$1 or more gets you:
XCOM: Enemy UnknownSid Meier's Civilization IIISid Meier's PiratesAce Patrol Bundle