Blutek via eBay offers the 2.4-lb. Apple MacBook Air Intel Haswell Core i5 1.3GHz 11.6" Laptop, model no. MD711LL/A, for $699.99 with free shipping. That's the lowest total price we could find by $100 (outside of the mention below) and the best we've seen for this system outright. It features an Intel Haswell Core i5 1.3GHz dual-core processor, 11.6" 1366x768 LED-backlit display, 4GB RAM, 128GB SSD, 802.11n wireless, Bluetooth 4.0, Thunderbolt, USB 3.0, and Mac OS X 10.9 Mavericks.

Of note: Students can get it for $649.99 with free shipping at Best Buy, as our recent post mentioned.