Other World Computing discounts a selection of used Apple Mac Pros, with prices starting at $575. Plus, all orders qualify for free shipping. Each item is covered by a 90-day OWC warranty. Note that for some models, available quantities may be limited. Some best bets, with comparisons against original retail prices:

• Used Apple Mac Pro Quad 2.66GHz Xeon Workstation for $679 (pictured, $2,370 off)
• used Apple Mac Pro 12-Core 2.93GHz Xeon Workstation for $2,829 ($3,670 off)