Asus M32-BF-R05 Desktop PC for $329.99 shipped.  Here is a screenshot for reference.  It features an AMD A10-7800 quad-core CPU at 3.5GHz with Turbo Boost to 3.9GHz, 8GB DDR3 RAM, 1TB 7200RPM hard drive, Gigabit ethernet, USB 3.0, integrated Radeon HD8760 Graphics, Windows 8.1, and more.  Most places have it for about $439.