EFXDigital via eBay offers the refurbished 2.38-lb. Apple MacBook Air Intel Core i5 1.6GHz 11.6" Laptop, model no. MC969LL/A, for $649.99 with free shipping. That's $40 under our mention of a refurb from a month ago and the lowest total price we've seen for this model. (For further comparison, it's also $99 under our mention of a used unit from last week.) It features an Intel Core i5 1.6GHz Sandy Bridge dual-core processor, 11.6" 1366x768 LED-backlit display, 4GB RAM, 128GB SSD, AirPort Extreme (802.11n wireless), Bluetooth 4.0, Facetime camera, Thunderbolt port, and Mac OS X 10.8 Mountain Lion.
Note: No warranty information is provided.