Great prices for classic RTS games that are still played regularly by thousands of people and that still have a large community.

Age of Empires Definitive Edition Bundle: https://store.steampowered.com/bundle/11831/Age_of_Empires_D...

From the website: Age of Empires III Complete Edition:

Immerse yourself in the award-winning strategy experience. Microsoft Studios brings you three epic Age of Empires III games in one monumental collection for the first time. Command mighty European powers looking to explore new lands in the New World; or jump eastward to Asia and determine the outcome of its struggles for power.

Enjoy!