Lenovo offers its Lenovo IdeaCenter Flex 20 Intel Haswell Core i3 1.7GHz 19.5" Multi-Touch All-in-One Desktop PC / Tablet, model no. 57323540, for $599.99 with free shipping. That's the lowest total price we coudl find by $70. This AIO desktop, which can also be used as a tablet, features an Intel Core i3-4010U 1.7GHz Haswell dual-core processor, 19.5" 1600x900 multi-touch LCD, 4GB RAM, 500GB hard drive, 802.11n wireless, Bluetooth 4.0, 4-cell battery, wireless keyboard and mouse, USB 3.0, and Windows 8.1 64-bit. (It doesn't have an optical drive.)