From now until April 8th, you can get many Microsoft Studios titles for up to 50% off on the Xbox Live Marketplace.
Thanks to Major Nelson who provided this easy-to-read table of all sales titles on his blog:
|Forza Horizon December IGN Pack||400||200||50%|
|Trials Evolution: Origin of Pain||400||200||50%|
|Pinball FX2 Tables|
|Marvel: Avengers Chronicles||800||400||50%|
|Plants vs Zombies Table||240||120||50%|
|Pinball FX Classic (Full)||800||400||50%|
|A World of Keflings||800||400||50%|
|Full House Poker||800||400||50%|
|Dust: an elysian Tail||1200||600||50%|
|Mark of the Ninja||1200||600||50%|
|Nike+ KT upper body and core workout||400||200||50%|
|Nike+ KT GonD||39.99||29.99||25%|
|Magic 2013 expansion pack||400||200||50%|
You can visit the sales page and start your purchases/downloads here.