GD: "Now through the 4th of July weekend, Impulse is giving PC gamers a chance to pick up several solid titles and bundles including Call of Duty 4, Flock!, Sins of a Solar Empire and more for varying discounts.
Additionally, all Epic Titles (a handful of Unreal titles) listed on the client have been given a 25% markdown, and even the Street Fighter IV pre-purchase gets in on the action with a slight discount."
