Yugster offers the refurbished 2.4-lb. Apple MacBook Air Intel Core i5 1.6GHz 11.6" Laptop, model no. MC969LL/A, for $549.99. Coupon code "DEALNEWSAIR" cuts it to $534.99. With $5 for shipping, that's the lowest total price we could find by $229, although we saw it for $85 less two weeks ago (that deal only included a 90-day warranty). It features an Intel Core i5 1.6GHz Sandy Bridge dual-core processor, 11.6" 1366x768 LCD display, 4GB RAM, 128GB SSD, AirPort Extreme (802.11n wireless), Bluetooth 4.0, Facetime camera, Thunderbolt port, USB, and Mac OS X 10.9 Mavericks (it includes an upgrade to 10.10 OS Yosemite). Deal ends December 17.
A 1-year warranty is applied, although it's unclear who backs it.