GainSaver offers the used Apple MacBook Intel Core 2 Duo 2.1GHz 13.3" Widescreen Notebook in White, model no. MB402LL/A, for $494.10. With free shipping, that's $5 under our mention of a refurbished unit from four weeks ago and the lowest total price we could find for this configuration of a used unit shipped. (It's $6 less than ordering a used unit for in-store pickup elsewhere.) Features include an Intel Core 2 Duo 2.1GHz processor, 13.3" 1280x800 glossy LCD, 512MB RAM, 60GB hard drive, DVD-ROM/CD-RW combo drive, iSight webcam, 802.11n, Gigabit Ethernet, Bluetooth 2.0+EDR, and more.

A 30-day warranty is supplied, although it is unclear who backs it.