This week's Xbox 360 Deal of the Week is on Assassin's Creed II add-ons and Avatar gear. The first add-on for sale is Sequence 12: Battle of Forli, which is on sale for 240 Microsoft Points ($3). The second is Sequence 13: Bonfire of the Vanities, which can be bought alone (for 240 MSP/$3) or with Secret Locations (for 400 MSP/$5).
The Avatar content includes Da Vinci's Flying machine, which you can get for 160 MSP ($2) and Guard Armor, which you can get for 240 MSP ($3).
As always, these deals are only available to Xbox Live Gold members and only last this week so get them while you can. Here are the links to add them to your Xbox 360 download queue: