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GameFly / GameFly UK has a Weekend Sale on COD games. Savings are between 25% – 50% off.
Call of Duty: World at War = $10 / £10
Call of Duty 4: Modern Warfare = $10 / £10
Call of Duty: Modern Warfare 2 = $15 / £15 (Steamworks)
Call of Duty: Modern Warfare 3 = $20 / £20 (Steamworks)
Call of Duty: Black Ops = $20 / £20 (Steamworks)
Stacks with their current 20% off coupon.
[Edit] Note that this doesn’t go live until 1pm EST. Posted it a little too early.