ExperCom offers the refurbished Apple Mac Pro Quad-Core 3.2GHz Xeon Workstation (pictured), model no. MD770LL/A, for $1,649 plus $29 for shipping. That's $50 under our October mention and the lowest total price we've seen for this model. (It's still $522 less than the best we could find for a new unit today.) It features an Intel Xeon W3565 3.2GHz quad-core processor, 6GB RAM, 1TB hard drive, SuperDrive, ATI Radeon HD 5770 1GB graphics, and Gigabit Ethernet. Deal ends October 22.

Also available is the refurbished Apple Mac Pro Intel Xeon 12-Core 2.4GHz Desktop PC (no monitor), model no. MD771LL/A, for $2,749 plus $29 for shipping. (It's the bottom option.) That's $50 our September mention and the lowest total price we've seen for this unit. (It's also $720 under the best we could find even for a used unit elsewhere.) It features dual Intel Xenon E5645 2.4GHz Westmere hexa-core processors (12 cores total), 12GB RAM, 1TB hard drive, SuperDrive, Radeon HD 5770 1GB graphics, 802.11n wireless, Bluetooth 2.1+EDR, and Mac OS X 10.7 Lion.

A 90-day ExperCom warranty applies for both models.