MegaMacs offers the refurbished Apple Mac Pro Xeon Quad-Core 2.8GHz Workstation, model no. MA970LL/A, for $949.99 plus around $34 for shipping. That's tied with our mention of a refurb from last month and $151 under the lowest total price we could find for a used unit with two quad-core processors (this unit only has one). It features an Intel Xeon 5300 Series 2.8GHz quad-core processor, 6GB RAM, 500GB hard drive, NVIDIA 8800 GT 512MB graphics, dual-layer SuperDrive, Bluetooth, and more. Deal ends June 26.

Of note, an OS is installed on this system, but it's unclear which version. A 30-day MegaMacs warranty applies.