MegaMacs offers the refurbished Apple MacBook Air Intel Core i7 2GHz 11.6" Laptop, model no. MD845LL/A, for $829.99 with free shipping. That's $800 under the lowest total price we could find for a comparable new model with a 512GB SSD. It features an Intel Core i7-2635QM 2GHz quad-core processor, 11.6" 1366x768 LED-backlit LCD, 8GB RAM, 256GB SSD, AirPort Extreme (802.11n wireless), Bluetooth 2.1+EDR, Gigabit Ethernet, iSight webcam, Adobe Photoshop Elements And Premiere Elements 12, and Mac OS X 10.9 Mavericks. Deal ends October 8.

A 90-day warranty is supplied, although it's unclear who backs it.