If you scroll to the Games page on your dashboard, you can find a panel for “Microsoft Studios Sale” that includes a plethora of big XBLA Games. Some of our favorites like Dust: An Elysian Tale and Mark of the Ninja can both be picked up 600 MSP (50% off). You might also want to jump on the Trials bandwagon, because both the original Trials HD and Trials: Evolution can be picked up for 400 MSP and 800 MSP respectively.
The sale will be available until April 8th Here is the complete list of games, including a few extras that you won’t find in the dashboard (like Retro City Rampage). Here is the full list of what’s on sale: