Best Buy offers the used 4.2-lb. Lenovo ThinkPad Yoga Intel Broadwell Core i5 2.2GHz 14" 1080p Touchscreen 2-in-1 Laptop in Black, model no. 20DM009GUS, bundled with a Webroot Secure Anywhere 3-Device 6-Month Subscription for $549.99 with free shipping. That's $149 below our December mention of a new laptop alone and the lowest total price we've seen for this laptop. (It's also $200 under a new model today.) It functions as a laptop or tablet and features an Intel Core i5-5200U 2.2GHz Broadwell dual-core processor, 14" 1920x1080 (1080p) LED-backlit touchscreen LCD, 8GB RAM, 1TB hard drive with 16GB M.2 storage, Nvidia GeForce GT 940M 2GB graphics, 802.11ac wireless, Bluetooth 4.0, HDMI, USB 3.0, 4-cell battery, and Windows 10 Home 64-bit.

A 90-day warranty applies, but it's unclear who backs it.