MegaMacs offers the used Apple iMac Intel Core 2 Duo 2.16GHz 20" Desktop, model no. MA589LL/A, for $499.99 plus around $35 for shipping. That's tied with our mention from last week for the lowest total price we could find, this time by $10. 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. Deal ends October 19 at 1 pm ET.

Note: A 30-day MegaMacs warranty applies. Also, Mac OS X is installed, but it's not clear which version. (OS installation discs are extra.)