Mass Effect is 50% off on Steam this weekend By Stephany Nunneley, Thursday, 5 November 2009 18:39 GMT Share on: Facebook Twitter Reddit Google+ This weekend on Steam, Mass Effect is 50 percent off. That means it’s only $9.99/€7.99/£6.99. Wondering how to get the Bring Down the Sky content? Look no further. Go get it kids. Thanks, EvilAvatar.