Currently over £39 on Amazon and £31.34 at cdkeys.com for the digital download if you prefer after using 5% facebook like.
Update 9/1/17 Amazon have now price matched at £27.99 however this price is "Exclusively for Prime Members"
The "Aztec Civilization DLC Pack" which includes the below is available at cdkeys.com for only 49p if you want to add this when your game arrives see Aztec DLC 49p
-Unique Unit: Eagle Warrior
-Unique Building: Tlachtli
-Wonder: Huey Teocalli