AoE2 is 80% off, so if you have been waiting for a chance to purchase the expansions for use with WK now is a good time to do so!
https://store.steampowered.com/app/221380/Age_of_Empires_II_HD/
Also it is 82% off if you buy the AoE2 & AoE3 bundle!
https://store.steampowered.com/bundle/2185/Age_of_Empires_Legacy_Bundle/
AoE3 by itself is 75% off
https://store.steampowered.com/app/105450/Age_of_Empires_III_Complete_Collection/
AoM is 75% off
https://store.steampowered.com/app/266840/Age_of_Mythology_Extended_Edition/