CowBoom offers the used 2-lb. Asus Flip Rockchip 1.8GHz 10.1" Convertible Touchscreen Chromebook, model no. C100PA-RBRKT03, for $124.99. Coupon code "Asus21116" drops it to $99.99. With free shipping, that's the lowest total price we could find for a used model by $48, although we saw it for $5 less two weeks ago. It features a Rockchip RK3288C 1.8GHz quad-core processor, 10.1" 1280x800 touchscreen LCD with 360-degree flip mode, 2GB RAM, 16GB flash memory, 802.11ac wireless, Bluetooth 4.1, webcam, and Google Chrome OS. Deal ends February 11.
Note that no warranty information is provided and that this used item may have scratches and scuffs. It also doesn't include an AC adapter and power cord.