The Apple Store offers the factory-refurbished 2.4-lb. MacBook Air Intel Haswell Core i5 1.4GHz 11.6" Laptop, model no. MD711LL/B, for $679 with free shipping. That's a $90 drop from five days ago and the lowest total price we've seen. (It's also $120 below the best price we could find for a new model.) It features an Intel Core i5 1.4GHz Haswell dual-core processor, 11.6" 1366x768 LED-backlit display, 4GB RAM, 128GB SSD, 802.11ac wireless, Bluetooth 4.0, Thunderbolt, USB 3.0, and Mac OS X 10.9 Mavericks. A 1-year Apple warranty applies.