JemJem offers the refurbished 2.3-lb. Apple MacBook Air Intel Core 2 Duo 1.4GHz 11.6" LED-Backlit Laptop for $339.99 plus $1.99 for shipping. That's the lowest price we could find by $8. It features an Intel Core 2 Duo SU9400 1.4GHz dual-core processor, 11.6" 1366x768 (720p) LED-backlit LCD, 2GB RAM, 64GB SSD, Nvidia GeForce 320M 256MB graphics, Facetime camera, AirPort Extreme (802.11n wireless), Bluetooth 2.1, USB, mini DisplayPort, and Mac OS X 10.6 (Snow Leopard). Deal ends May 5.
Note: A 30-day JemJem warranty applies, and it comes with a non-OEM charger. Also, while an 11" 1440x900 display is noted on the page, it's actually an 11.6" 1366x768 display, according to Apple.