1600 Marketplace Points With Halo 3 Pre-Order news from 1UP.com:

Face it, you know you’re going to buy Halo 3 if you own an Xbox 360, so why not get rewarded for pre-ordering the game. In what can be seen as an attempt to drive sales, Best Buy is currently featuring a deal where if you pre-order Halo 3 you get 1600 Xbox Live Marketplace points for just $4.99 (1600 points normally cost $19.99).