I so wanted this to be an easy link job... but the Xbox.com site has literally zero mention of the sale, but yeah if you check on your 360 atm there is a 2k sale going on atm with a few decent offerings to be had in it. I'm just going to list a few examples, many of the games listed have their dlc reduced by a lot too but yeah if you're interested in the sound of it go and power on your 360 and take a look over it.
WWE2k14 - 33% off - $40.19
Saints Row 4 - 33% off - $39.99
Borderlands 2 - 67% off - $9.89
X-Com enemy unknown - 66% off - $13.59
Spec OPs the line - 75% off - $7.49
Bioshock - 75% off - $4.99
Bioshock 2 - 75% off - $4.99
Duke Nukem Forever - 75% off - $4.99
Mafia 2 - 75% off - $4.99
X-Com enemy within - 50% off - $19.99
Aight that's the main games involved anyway and there is a ton of dlc reduced for Bioshock 1/2/infinite , WWE2k14, Borderlands 2 and Mafia 2.
I'm not sure when the sale started nor do I know when it will end but if any of that stuff I listed tickles your fancy go and power up your 360 and get it before the sale goes away as quietly as it appeared.
Fancy hearing me on an amateur podcast with friends gushing over one of my favourite games? https://youtu.be/1I7JfMMxhf8