Refurbished HP Firebird Core 2 Quad 2.66GHz Desktop PC+ $27 s&h

eCOST.com offers the refurbished HP Firebird VoodooDNA 802 Intel Core 2 Quad 2.66GHz Desktop PC, model no. GM339AA#ABA, for $699.99 plus $34.29 for shipping.  That's $30 under the lowest total price we could find for a factory-sealed model. Billed as a gaming PC, it features an Intel Core 2 Quad Q9400 2.66GHz quad-core processor, 4GB PC2-6400 RAM, two 250GB 5400 rpm Serial ATA hard drives (500GB total), DVD burner, two NVIDIA GeForce 9800S 512MB video cards, Gigabit Ethernet, wireless keyboard and mouse, two eSATA ports, HDMI output, and Windows Vista Home Premium 64-bit.

Note that a 90-day warranty applies, although it's unclear who supports it.  Deal ends November 21 at 9 pm ET.