MegaMacs offers the refurbished Apple Mac Pro Quad-Core 2.66GHz Xeon Workstation, model no. MB871LL/A, with Adobe Lightroom 5 or Adobe Photoshop Elements 12 & Adobe Premiere Elements 12 for Windows and Mac for $549.99 plus about $28 for shipping. That's at least $80 under the lowest total price we could find for a used Mac Pro with either software pack. It features an Intel Xeon W3520 2.66GHz quad-core processor, 4GB RAM, 500GB 7200 rpm hard drive, SuperDrive, NVIDIA GeForce GT 120 512MB graphics, and Gigabit Ethernet.

Note: A 30-day MegaMacs warranty applies. Also, an OS is installed, but it's unclear which version.