Steam's Autumn Sale has just begun, offering huge discounts on great games. There will be a new list of games each day starting now until the 27th, with "hundreds" of deals to be had before the week's end.
Today alone, Portal 2 is only $10, Black Ops is $30, and Mass Effect 2 is $5. Sure they're games you probably already have played, but for anyone who missed any of these titles, with these prices, there's no excuse not to grab them now.
Check out all of the deals on the Steam store.