MegaMacs offers the used Apple iMac Intel Core 2 Duo 2.16GHz 24" Desktop, model no. MA456LL/A, for $569.99 plus around $22 for shipping. That's a $10 drop from our mention of a similar used one last summer (which had more RAM, but weaker graphics) and $119 under the lowest total price we could find for a refurb. It features an Intel Core 2 Duo T7400 2.16GHz dual-core processor, 24" 1920x1200 widescreen LCD, 1GB RAM, 250GB 7200 rpm hard drive, DVD burner, NVIDIA GeForce 7300 GT 128MB graphics, 802.11n wireless, Bluetooth, iSight webcam, and more. Deal ends February 22 at 1 pm ET.

Note: A 30-day MegaMacs warranty applies. Also, an OS is installed on this system, but it's unclear which OS it is.