CowBoom offers the 3-lb. used Lenovo Yoga 2 Intel Haswell Core i5 1.6GHz 11.6" 2-in-1 Touchscreen Laptop in Silver/Black, model no. 59430705, for $284.99 with free shipping. That's $315 under our May mention of a new unit, $415 off list, and the best price we could find. It features an Intel Core i5-4202Y 1.6GHz Haswell dual-core processor, 11.6" 1366x768 touchscreen LCD, 4GB RAM, 128GB SSD, 720p webcam, 802.11ac wireless, Bluetooth 4.0, USB 3.0, and Windows 8.1. (It doesn't include an optical drive.)
Note that new customers can apply coupon code "CowBoom10" to cut the price further to $274.99.