MegaMacs offers the refurbished Apple iMac 20" Intel Core 2 Duo 2.66GHz All-in-One Desktop, model no. MB324LL/A, for $419.99 plus around $24 for shipping. That's $8 under our refurb mention from a month ago and the lowest total price we've seen for this model. (It's also $22 under the best price we could find for a refurb elsewhere.) Features include an Intel Core 2 Duo E8335 2.66GHz dual-core processor, 20" 1680x1050 widescreen LCD, 2GB RAM, 320GB hard drive, DVD burner, NVIDIA GeForce 9400M 256MB graphics card, Bluetooth 2.0+EDR, AirPort Extreme (802.11n wireless), iSight webcam, and Mac OS X 10.9 Mavericks.
A 30-day MegaMacs warranty applies.