Tanga offers the refurbished Apple MacBook Air Intel Haswell Core i5 1.4GHz 13.3" Laptop, model no. MD760LL/B, for $539.99 with free shipping. That's tied with our mention from February and the lowest total price we could find now by $200. It features an Intel Core i5 1.4GHz 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 10.9 Mavericks. It comes with an Apple Care warranty valid until May.