Microsoft Store offers preorders of Halo 4 for Xbox 360 bundled with a $25 Microsoft Store Credit for $59.99 with free shipping. That's tied with our mention from five weeks ago and, assuming you use the credit, the lowest total price we could find by $25. Sales tax is added where applicable. This game is due for release on November 6.
Note that the credit will be added to your account within a week of the game's release.