All three Halo: Reach map packs are half price this week, with Noble and Defiant packs at 400 Microsoft Points and the Anniversary pack at 600 Microsoft Points. A great opportunity to get hold of them while there's still time to enjoy them before Halo 4 comes out. A quick look to the right reveals you should get 174 days usage from them!
Each pack comes with new achievements too, with a total of 700 additional Gamerscore available across the 3 packs.
Those links again if you want to order them from your PC:
> Noble Map Pack <
> Defiant Map Pack <
> Anniversary Map Pack <
- Cowboy Out.