Apple Store offers the factory-refurbished 2.4-lb. Apple MacBook Air Intel Core i5 1.7GHz 11.6" LED-Backlit Laptop, model no. MD223LL/A, for $849 with free shipping. (It's the 3rd system from the top.) That's tied with our refurb mention from last week and $51 under the lowest total price we could find for a new unit. Sales tax is added where applicable. It features an Intel Core i5-2557M 1.7GHz dual-core Sandy Bridge processor, 13.3" 1440x900 LED-backlit widescreen LCD, 4GB RAM, 64GB SSD, AirPort Extreme (802.11n wireless), Bluetooth 4.0, Facetime camera, Thunderbolt port, and Mac OS X Lion. A 1-year Apple warranty applies.