Other World Computing offers the used Apple iMac Core 2 Duo 1.83GHz 17" Desktop, model no. MA710LL/A, for $139 with free shipping. That's tied with last week's mention and the lowest total price we could find for it in similar condition by $125. Features include an Intel Core 2 Duo T5600 1.83GHz dual-core processor, 17" 1440x900 LED-backlit display, 1GB RAM, 160GB 7200 rpm hard drive, AirPort Extreme (802.11n), three USB 2.0 ports, iSight video camera, Gigabit Ethernet, and OS X Tiger (10.4.8).

Note that software restore disks, keyboard, and mouse are not included.