EXF Digital via eBay offers the refurbished 2.3-lb. Apple MacBook Air Intel Core 2 Duo 1.4GHz 11.6" Widescreen Notebook, model no. MC505LL/A, for $639.99 with free shipping. That's $39 under our mention from last year's Black Friday weekend and the best price we've seen. (It's also $40 under the lowest total price we could find for a refurb elsewhere.) Features include an Intel Core 2 Duo SU9400 1.4GHz dual-core processor, 11.6" 1366x768 LED-backlit widescreen glossy LCD, 2GB RAM, 64GB SSD drive, 802.11n wireless, Bluetooth 2.1 + EDR, multi-touch trackpad, iSight webcam, and Mac OS X 10.8 Mountain Lion.

A 60-day EFX warranty applies.