As one of its daily deals, MidnightBox offers the refurbished Apple iMac Core Duo 2.4GHz 20" Desktop, model no. MB323LL/A, for $549.95 plus $3.99 for shipping. That's $42 under the lowest total price we could find for a similarly-configured refurb with less memory. (For further comparison, we saw a similar refurb with less RAM for $27 more last spring.) Features include an Intel Core 2 Duo 2.4GHz dual-core processor, 20" 1680x1050 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 10.8 (Mountain Lion). Deal ends today.

Note: A 30-day MidnightBox warranty applies.