Impulse purchasing may be in the stars this weekend if you're a PC gamer without Mass Effect 2 yet -- seriously, what are you waiting for? This weekend, Impulse has the regular and "digital deluxe" edition of Commander Shepard's suicide mission for $30 and $40, respectively. That's $20 off the regular price.
Other deals include indie darling World of Goo and the experimental Mirror's Edge for $10. The full list of discounted games is after the break.