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. :
Forza 3 Ultimate Edition Xbox 360 Game - Newegg.com
Amazon.com: Forza Horizon 3 - Ultimate Edition - Xbox One : Forza Horizon 3 Ultimate Edition: Video Games
Forza Horizon 3: Ultimate Edition Xbox One 7HD-00001 - Best Buy
Forza Horizon 4 and Forza Horizon 3 Ultimate Editions Bundle - XBox One Games - Gameflip
Forza Horizon 3 XBOXONE Back cover
Amazon.com: Forza Horizon 3 - Ultimate Edition - Xbox One : Forza Horizon 3 Ultimate Edition: Video Games
Forza Horizon 3 Gameplay: All Cars Included in the Ultimate Edition - YouTube
65% discount on Forza Horizon 4 and Forza Horizon 3 Ultimate Editions Bundle Xbox One — buy online — XB Deals USA
Deal: Forza Horizon 3 Ultimate Edition now available for £29.99 - MSPoweruser