MegaMacs offers the used Apple iMac Intel Core 2 Duo 2.16GHz 20" Desktop (pictured), model no. MA589LL/A, for $599.99 plus around $35 for shipping. That's the lowest total price we could find by $90. Features include an Intel Core 2 Duo T7400 2.16GHz dual-core processor, 20" 1680x1050 widescreen LCD, 1GB RAM, 250GB hard drive, dual-layer DVD burner, 802.11n wireless, Bluetooth, iSight webcam, and more. A 30-day MegaMacs warranty applies.

Of note, MegaMacs also offers the used Apple iMac Intel Core 2 Duo 2.33GHz 24" Desktop, model no. MA456LL/A, for $749.99. plus around $40 for shipping. That's a $140 drop from our January mention and the lowest total price we could find. It features an Intel Core 2 Duo T7600 2.33GHz dual-core processor, 24" 1920x1200 widescreen LCD, 2GB RAM, 320GB hard drive, dual-layer DVD burner, 802.11n wireless, Bluetooth, iSight webcam, and more. A 30-day MegaMacs warranty applies.