ExperCom offers the refurbished 3-lb. Apple MacBook Air Intel Core i5 1.8GHz 13.3" Laptop, model no. MD231LL/A, for $849. Coupon code "AIR" drops the price to $749. With $11.50 for shipping, that's $159 under the lowest total price we could find for a new unit (with only 4GB RAM) purchased elsewhere. It features an Intel Core i5-3427U 1.8GHz Ivy Bridge dual-core processor, 13.3" 1440x900 LED-backlit LCD, 8GB RAM, 128GB SSD, AirPort Extreme (802.11n wireless), Bluetooth 4.0, Facetime camera, Thunderbolt and USB 3.0, and Mac OS X (it's unclear which version). Coupon expires January 31.
A 90-day Expercom warranty applies.