Not the cheapest ever, but much cheaper.
Northgard is a strategy game based on Norse mythology in which you control a clan of Vikings vying for the control of a mysterious newfound continent.
For Windows, MacOS and Linux.
Recent Reviews: Very Positive (271)
All Reviews: Very Positive (30,436)
Release Date: 8 Mar, 2018
Developer: Shiro Games
"It's like a combination of Age of Empires and Civilisation", I once heard.