CowBoom offers the used 2-lb. Microsoft Surface Pro 2 10.6" 128GB Windows 8 Tablet, model no. 6CX-00001, for $599.99. Apply coupon code "SMART30" to drop it to $569.99. With free shipping. That's $229 less than our mention of a new one from two weeks ago and the lowest total price we've seen. It features an Intel Core i5 processor, 10.6" 1920x1080 (1080p) multi-touch LCD, 4GB RAM, 128GB internal flash storage, 802.11n wireless, Bluetooth 4.0, front- and rear-facing 720p HD cameras, USB 3.0 (full size), Mini DisplayPort, microSD card slot, Surface Pen, and Windows 8.1 Pro.

Note that accessories (such as an AC adapter, stylus, and headphones) may not be included.