CowBoom offers the refurbished 2.3-lb. Apple MacBook Air Intel Core 2 Duo 1.4GHz 11.6" Widescreen Notebook, model no. MC505LL/A, for $649.99 with free shipping. That's the lowest total price we've seen for any refurbished MacBook Air laptop. (We've listed this same model with an Apple warranty for $49 more several times this year, however.) It's also $211 less than the best total price we could find for a new one. Sales tax is added where applicable. 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 10.7 Lion.

No warranty information is provided.