Tanga offers the refurbished 2.4-lb. Apple MacBook Air Intel Haswell Core i5 1.3GHz 11.6" Laptop, model no. MD711LL/A, for $379.99 with free shipping. That's $12 under last month's mention and the lowest total price we've seen. (It's the best deal for a refurb today by $50.) It features an Intel Core i5-4250U 1.3GHz Haswell dual-core processor, 11.6" 1366x768 (720p) LED-backlit display, 4GB RAM, 128GB SSD, 720p FaceTime camera, 802.11ac wireless, Bluetooth 4.0, Thunderbolt, and Mac OS X 10.8 (Mountain Lion).
Note: This Grade B refurbished item will show signs of wear; a 90-day warranty applies, but it's unclear who backs it.