Microsoft must be running out of room in their digital warehouse. Xbox LIVE's Major Nelson has a preview of some new deals in the coming weeks. Xbox LIVE is having an end of the year blow-out sale. There are some great co-op titles for 50% off, like Castle Crashers and The UnderGarden. Add-on content for Borderlands: Claptrap's New Robot Revolution is also half off. There are some fun non-co-op titles available for a discount as well.