The Steam Summer Sale is on Now!

The game and select DLCs are on Sale:

http://store.steampowered.com/app/381210
https://store.steampowered.com/app/1009820
https://store.steampowered.com/app/971790
https://store.steampowered.com/app/1009821
https://store.steampowered.com/app/925750
https://store.steampowered.com/app/799200
http://store.steampowered.com/app/750381
http://store.steampowered.com/app/700282
http://store.steampowered.com/app/530711
http://store.steampowered.com/app/700280