For Sltherine's 22nd birthday, you can enter the "HAPPYBIRTHDAY" code to your purchases this week for a 30% discount.
https://www.slitherine.com/news/happy-birthday-slitherineThe following games & DLC's are not part of the sale:
Starship Troopers: Terran Command
Strategic Command: American Civil War
Warhammer 40k: Gladius – Escalation pack
Field of Glory II: Medieval – Rise of the Swiss
Distant Worlds 2
Campaign Series: Vietnam
Valor&Victory: Stalingrad
Warhammer 40k: Battlesector – Necrons
Panzer Corps 2: Axis Ops 1943