PSA: Horizon 3 is 67-70% off until the end of September. This is the last chance to buy the game and its DLC before they are inevitably delisted from the Microsoft Store. :
65% discount on Forza Horizon 4 and Forza Horizon 3 Ultimate Editions Bundle Xbox One — buy online — XB Deals USA
Buy Forza Horizon 3 1972 Land Rover Series III - Xbox Store Checker
Amazon.com: Forza Horizon 3 – Xbox One : Microsoft Corporation: Video Games
Forza Horizon 3 Demo – Forza Support
Forza Horizon 3 is now available to pre-load on Windows 10 PC - AR12Gaming
Forza Horizon 3's Blizzard Mountain Expansion out now in Microsoft Store
FH3 January Car Pack Contents Leaked on Windows Store – GTPlanet