MegaMacs offers the refurbished Apple iMac Intel Core 2 Duo 3.06GHz 21.5" Desktop, model no. MC413LL/A, for $649.99 plus $31.68 for shipping. That's within a buck of the lowest total price we've seen. (We saw it for about a buck less three weeks ago.) This iMac features an Intel Core 2 Duo E7600 3.06GHz dual-core processor, 21.5" 1920x1080 (1080p) LCD, 4GB RAM, 256GB SSD, SuperDrive, Bluetooth 2.1+EDR, AirPort Extreme, and OS X 10.9 Mavericks. Deal ends January 7.

A 90-day MegaMacs warranty applies.