ANTOnline offers the Lenovo Thinkstation E32 Intel Haswell Core i3 3.5GHz Desktop PC (no monitor) for $459 with free shipping. That's the lowest total price we could find by $211. It features an Intel Core i3-4330 3.5GHz Haswell dual-core processor, 4GB RAM, 500GB hard drive, DVD-ROM, Gigabit Ethernet, and Windows 7 Professional 64-bit.

Update: The price has dropped to $449.