Major Nelson just sent out a very big reminder to folks that Microsoft will be having an Ultimate Game sale starting July 5th through July 11th. Approximately 250 deals can be had across Xbox One, Xbox 360, Windows Phone and Xbox One hardware. Most games will be anywhere form 40%-60% off with a few with even steeper discount.
There will also be around 30 PC games on sales, which you can check out that list here including Quantum Break, Rise of the Tomb Raider and Gears of War: Ultimate Edition.
To see the entire list of Xbox One and Xbox 360 content, check out Major Nelson's blog post, with the titles by content at the bottom.