Today only until 1 pm ET, Overstock.com offers the factory-refurbished Apple iMac Intel Core 2 Duo Dual-Core 2.4GHz 20" Desktop, model no. MA877LL/A, for $649.99 plus $2.95 for shipping. That's $7 under the lowest total price we could find for a similar configuration with a smaller hard drive. Features include an Intel Core 2 Duo 2.4GHz dual-core processor, 20" 1680x1050 widescreen LCD, 1GB RAM, 320GB 7200 rpm hard drive, Bluetooth 2.0+EDR, 802.11n wireless, and Mac OS X 10.4 (Tiger).

A 30-day warranty applies, although it's not clear who backs it.