Aspyr, who are doing the ports of all Civ games to Mac, are now 25 years old! There is a Steam sale with 85% discount on Civ6, and 75% on Civ: BE, until October 18.
You can find the whole sales overview here: https://store.steampowered.com/sale/aspyr25
In addition to this they also have a celebratory give-away: You can win a new gaming PC and 25 Steam keys. You can find all the information about the anniversary and the give-away here: https://aspyr.com/25years
Discuss Aspyr’s birthday in our forum here: https://forums.civfanatics.com/threads/25-years-aspyr-big-discounts-on-civ6-civ-be-and-win-a-new-pc-and-free-games.673705/