Apple Store again has stock of the 2.4-lb. Apple MacBook Air Intel Ivy Bridge Core i5 1.7GHz 11.6" Laptop, model no. MD223LL/A, for $599 with free shipping. That's $400 off list and tied with our mention from earlier this week (which sold out in a few hours) as the least expensive 12" MacBook Air we've ever seen with an Apple warranty. It features an Intel Core i5-3317U 1.7GHz Ivy Bridge dual-core processor, 11.6" 1366x768 LED-backlit LCD, 4GB RAM, 64GB SSD, Facetime camera, Thunderbolt, USB 3.0, 802.11n wireless, Bluetooth 4.0, and Mac OS X. (It lacks an optical drive.)