Until 3 pm ET today, MegaMacs offers the used Apple Mac Pro Xeon 8-Core 2.26GHz Workstation, model no. MB535LL/A, for $3,249.99 plus around $59 for shipping. That's the lowest total price we could find for this configuration. This Mac Pro features two Intel Xeon 2.26GHz quad-core processors, 12GB RAM, three 1TB hard drives, dual-layer DVD burner, 80211n wireless, Bluetooth, and more. A 30-day MegaMacs warranty applies.

Of note, an OS is installed on this system, but it's unclear as to which version.