Steam cuts up to 75% off a selection of game downloads for Windows, Mac, Linux, and SteamOS, with prices starting from $2.49, as part of its SteamOS Sale. All the titles will be available for SteamOS in the future, and select games are already available, including Batman: Arkham Knight (pre-order), Borderlands: The Pre-Sequel, Sid Meier's Civilization: Beyond Earth, Wasteland 2, Torchlight II, and Goat Simulator. Deal ends March 9.