I know this is a long ways out.
This game will be released November 9, 2010. Amazon is offering Call of Duty: Black Ops Pre-Order on the PS3 and XBOX360 with $20 Amazon Video Game Credit + FS with Amazon Prime or FSSS.
This game has the Pre-Order Price Guarantee which means you will be charged the lowest price once the game has been released.
Also you will not be charged until the game is shipped. By placing the order now, you are basically guaranteed a copy once released.