MegaMacs offers the refurbished Apple Mac Pro Intel Xeon 4-Core 2.66GHz Workstation, model no. MA356LL/A, for $509.99 plus around $25 for shipping. That's $2 under last month's mention and $14 under the lowest total price we could find for a similarly-configured used unit elsewhere. It features dual Intel Xeon 2.66GHz Woodcrest dual-core processors (four cores total), 2GB RAM, 250GB 7200 rpm hard drive, dual-layer SuperDrive, NVIDIA GeForce 7300 GT 256MB graphics, and OS X 10.6 Snow Leopard. Deal ends June 26.

Note: A 30-day MegaMacs warranty applies.