One of the beauties of digital distribution becoming popularized is that gamers can have ready access to sales of their favorite titles. Direct2Drive is taking advantage of that fact by giving gamers a discount on all FPS titles and their spinoffs.
The 10% discount is not valid on pre-orders or items which aren't full price and can be redeemed by entering the phrase "LOCKNLOAD" at checkout. This code can be used on 190+ titles including Fallout: New Vegas. Moreover, should you want to pre-order Call of Duty: Black Ops from D2D, they are offering 20% off coupons which can be used towards any other Call of Duty purchase.