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. A couple of bests, with comparisons to other used units:

• Used Apple iMac Core 2 Duo 1.8GHz 17" 160GB Desktop for $139 (low by $11)
• used Apple iMac Core i5 2.7GHz 21.5" 1TB Desktop for $949 (pictured, low by $224)