Tanga offers the refurbished Apple MacBook Air Intel Core i5 1.7GHz 11.6" Laptop, model no. MD224LL/A, bundled with a new Level8 Carrying Case in Black, model no. LA-1494-02F00, for $579 with free shipping. That's $100 under our mention of a refurb laptop alone from three weeks ago (although that deal included a 1-year Apple warranty) and the lowest total price we've seen for this model. (It's also a current price low for a refurb laptop with a new case by $68.) The laptop features an Intel Ivy Bridge Core i5-3317U 1.7GHz dual-core processor, 11.6" 1366x768 LCD, 4GB RAM, 128GB flash storage, 802.11n wireless, Bluetooth 4.0, Facetime camera, Thunderbolt, and Mac OS 10.9 Mavericks.
A 90-day warranty is applied, although it's unclear who backs it.