Other World Computing discounts a selection of used Apple iMacs, with prices starting at $139. 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 to other used units:

• Used Apple iMac Core 2 Duo 1.8GHz 17" 160GB Desktop for $159 (pictured, low by $56)
• used Apple iMac Core i5 2.5GHz 22" 500GB Desktop for $869 (low by $16)