More than 10,000 retailers in the United States alone are expected to open their doors at midnight on September 25 to begin selling Halo 3.
One million copies of the game have already been pre-ordered in North America. The company also recently announced pricing for a Halo 3-themed Xbox 360 console.
Halo 2 sold 2.4 million copies and earned up to US 125 million in its first 24 hours on store shelves. Microsoft expects Halo 3's launch to shatter its predecessor's day-one entertainment sales record.