Other World Computing discounts a selection of used Apple Mac Pros, with prices starting at $729. 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 2.93GHz Xeon Workstation for $799 (pictured, $2,050 off)
• used Apple Mac Pro 8-Core Xeon 2.26GHz Workstation for $1,079 ($2,020 off)