This deal has ended.
Lenovo takes $150 off the price of this IdeaCentre Desktop (model K305 08901AU) via code USPK31A1011. This drops the price to $549 with free shipping. This desktop features AMD's Phenom II 2.6GHz quad core processor and 6GB of RAM, so it is one of the most powerful computers we've seen in this price range. Note that it does not come with a monitor. Sales tax is charged in most states.