Barnes & Noble offers the refurbished Apple MacBook Intel Core 2 Duo 2GHz 13.3" Widescreen Notebook, model no. MB061LL/A, for $384.99 plus $6.49 for shipping. That's the lowest total price we could find for a refurbished model by $8. It features an Intel Core 2 Duo T7200 2GHz dual-core processor, 13.3" 1280x800 widescreen LCD, 1GB RAM, 80GB hard drive, DVD/CD-RW combo drive, 802.11n wireless, Bluetooth, iSight webcam, and Mac OS X 10.4 Tiger.

Note: No warranty information is provided. Also, Barnes & Noble lists both OS X 10.4 and 10.5 for this MacBook; this model originally shipped with OS X 10.4 so it's likely that that's what's included.