Microsoft is doing another GoD sale. There are games on sale for the whole week and there are daily deals. Remember that the prices are different for other countries so check and also sometimes it's cheaper if you buy the game using Microsoft points.
Here is the sale for July 2nd and the games that are on sale for the whole week. Expect to see price drops on XCOM, Bioshock Infinite, MGS Revengance and Tomb Raider.