Xbox Live has started a Deal Of The Week program, promising to have some sort of weekly special discount on purchasable DLC. Kicking off this program is a discount on the XBLA title, Braid. Originally 1200 MS Points ($15), the full version of Braid can now be bought for 800 MS Points ($10) this week only.
Look for upcoming deals on other XBLA titles, map packs, or even Xbox Originals in the weeks to come.