If you missed Red Dead Redemption the first time around, you can snap up the western GTA right now on the cheap, just in time for the sequel to release on October 26th. Well, technically Red Dead Redemption 2 is a prequel, but you know what I mean.The game is backwards compatible and runs smooth on the Xbox One.
There's also Shadow of the Tomb Raider on sale, and with the Forge dlc on its way, now is a good time to grab up the base game for $45 bucks, provided you have Gold of course.
Quiplash is another good get if you are looking for some party style fun. Played over 3 rounds, players are given two prompts to supply an answer for, and each prompt is seen by two random players. Once the responses have been written, the prompt and the two provided answers are shown, and players and the audience vote on which is funniest, with the players that provided the answers given points on how many votes they get. If they end up getting all of the votes, they get a "quiplash" and earn a bonus score. The final round has all players reply to the same prompt, and players subsequently select three of the answers as the funniest. It's actually a lot of fun, and you can pick it up for $ with Gold.
There's a bunch more games at good prices on the official site, and you can look at all of them here.