AltaTac via eBay offers the refurbished 2.4-lb. Apple MacBook Air Intel Ivy Bridge Core i5 1.7GHz 11.6" Laptop, model no. MD224LL/A, for $429.95 with free shipping. That's $20 under our August refurb mention and the lowest total price we've seen. (It's also the best deal we could find for a refurb now by $219.) It features an Intel Core i5-3317U 1.7GHz Ivy Bridge dual-core processor, 11.6" 1366x768 (720p) LED-backlit LCD, 4GB RAM, 128GB SSD, 802.11n wireless, Bluetooth 4.0, Facetime camera, Thunderbolt, USB 3.0, and Mac OS X 10.8.2 (Mountain Lion).
A 90-day warranty applies, although it's unclear who covers it. Note that the item may have cosmetic blemishes, including scratches, scuffs, or dents.