MegaMacs offers the used Apple Mac Pro Intel Xeon 2.8GHz Desktop PC (no monitor) for $1,799.99. With around $49 for shipping, that's the lowest total price we could find for a quad-core Mac Pro desktop with these specs. Features include an Intel Xeon 5300 2.8GHz quad-core processor, 8GB RAM, 500GB hard drive, 320GB hard drive, NVIDIA 8800GT graphics with 512MB RAM, dual layer DVD burner, mouse, and keyboard. Note that this system ships with an unspecified OS pre-installed; however, the installation discs may not be included. Deal expires August 3 at 1 pm ET.

A 30-day MegaMacs warranty applies.