Microsoft is running an excellent Xbox 360 Spring Clearance sale for the Xbox LIVE store, with discounts on titles, season passes and DLC packs up to 75 percent off. Some of the titles include the Arkham franchise, Borderlands 2, Assassin's Creed IV, Saints Row IV and more:

As noted in both screenshots, the sale lasts until April 21st so if you're interested, take advantage of this offer now.