MegaMacs offers the refurbished Apple iMac Core Duo 2.4GHz 20" Desktop, model no. MB323LL/A, for $539.95 plus around $24 for shipping. That's the lowest total price we could find for a similarly-configured refurb by $196, although we saw it for $10 less in November. Features include an Intel Core 2 Duo E6600 2.4GHz dual-core processor, 20" 1680x1050 LED-backlit LCD, 2GB RAM, 250GB 7200 rpm hard drive, ATI Radeon HD 2400 XT 128MB graphics, SuperDrive, 802.11g wireless, Bluetooth 2.1 + EDR, webcam, and Mac OS X 10.6 (Mountain Lion).

Note: A 30-day MegaMacs warranty applies.