The Gold Box spotlight deal of the day over at Amazon today is Call of Duty: Modern Warfare 2 for Xbox 360, PS3, or PC for only $39.99 each (that’s 33% off the list price of $59.99).

This sequel to Call of Duty 4: Modern Warfare sold almost 5 million copies in its first day of release back in November, so chances are, most of you who wanted it already own it, but if you were holding out for a sale — the day is here! But, this sale is only for today while supplies last, so grab it while you can before it sells out.

From what I’ve been told, Call of Duty: Modern Warfare 2 combines a thrilling single player story with some very fine cooperative segments to make one of the best multiplayer games ever. This sequel takes place five years after the original Modern Warfare (all other Call of Duty games take place in a World War II setting), and sees you filling the shoes of multiple different characters as they fight in battles all over the world.

From the product page:

• Epic single-player campaign picks up immediately following the thrilling events from Call of Duty 4: Modern Warfare
• The definitive multiplayer experience returns, with a host of new perks and enhancements
• New cooperative SpecOps mode, the perfect combination of Modern Warfare’s single player intensity and the addictive replayability of its multiplayer
• Special Ops Mode allows two players, either alone or with a friend, to engage in unique mission play and features split-screen functionality.
• ‘Modern Warfare 2′ contains new and updated weapons, new weapons attachments, and a variant of the multiplayer weapons customization system from ‘Call of Duty 4′, now available in the single player campaign.