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. A couple of best bets, with comparisons against original retail prices:

• Used Apple Mac Pro Xeon Quad 2.66GHz Workstation w/ 4GB RAM for $649 ($2,351 off)
• used Apple Mac Pro Xeon 6-Core 3.33GHz Workstation w/ 16GB RAM for $1,829 (pictured, $5,118 off)