Make sure whether it's 2x dual core or 2x quad core. If it's the first one, this price would be quite good for fully loaded machine (i.e. lot of RAM, decent graphics card, etc.). If the latter - price is very good.
Apple Mac Pro (2006) 2.66GHz 4-Core 4GB Memory / 250GB 7200RPM HD / SuperDrive / 7300GT Video. Apple OS X 10.5.8 pre-installed. Apple Extended Keyboard & Mighty Mouse Included. Warranty: 90 Days. Used, Excellent Condition.