MegaMacs offers the refurbished 2.4-lb. Apple MacBook Air Intel Core i5 1.6GHz 11.6" LED-Backlit Laptop, model no. MC968LL/A, for $389.99 plus around $20 for shipping. That's $93 under our mention from three days ago and the lowest total price we've seen for this laptop. (It's also $93 under the best deal we could find for a used unit with 4GB RAM elsewhere.) It includes an Intel Sandy Bridge Core i5-2467M 1.6GHz dual-core processor, 11.6" 1366x768 LED-backlit LCD, 2GB RAM, 64GB SSD, AirPort Extreme (802.11n wireless), Bluetooth 4.0, Facetime camera, USB, Thunderbolt, and Mac OS X. (No optical drive is included.)

A 30-day MegaMacs warranty applies. Also, it's unclear which operating system is installed; the product pages displays both OS X 10.7 and 10.9.