While this is not the all time lowest price for this game, it is still a great price, especially since it is not on sale that often.
There is still a very active community and multiplayer is well and truly alive!
Caution: the game can be very addictive!
From the website:
In Age of Empires II: HD Edition, fans of the original game and new players alike will fall in love with the classic Age of Empires II experience. Explore all the original single player campaigns from both Age of Kings and The Conquerors expansion, choose from 18 civilizations spanning over a thousand years of history, and head online to challenge other Steam players in your quest for world domination throughout the ages. Originally developed by Ensemble Studios and re-imagined in high definition by Hidden Path Entertainment, Skybox Labs, and Forgotten Empires, Microsoft Studios is proud to bring Age of Empires II: HD Edition to Steam!
Age of Empires III Collection is also on sale: $14.33 AUD: https://www.humblebundle.com/store/age-of-empires-iii-comple...