TekReplay via eBay offers the refurbished Apple MacBook Air Intel Haswell Core i5 1.3GHz 13.3" LED-Backlit Laptop, model no. MD760LL/A, for $579.99 with free shipping. That's the lowest total price we could find by $19 and tied as the best deal we've seen on this model. This mid-2013 laptop features an Intel Haswell Core i5-4250U 1.3GHz dual-core processor, 13.3" 1440x900 LED-backlit LCD, 4GB RAM, 128GB SSD, 802.11ac wireless, Bluetooth 4.0, Facetime camera, Thunderbolt, and Mac OS X 10.8 Mountain Lion.
Note: A 1-year TekReplay warranty applies.