Always Deals via eBay offers the Microsoft Surface Pro 4 128GB 12.3" Windows Tablet in Silver for $639.99 with free shipping. That's $10 under our mention from a month ago and the best price we've seen. (It's a low today by $76.) It features an Intel Core i5-6300U 2.4GHz Skylake dual-core processor, 12.3" 2736x1824 multi-touch LCD, 4GB RAM, 128GB internal flash storage, USB 3.0, mini DisplayPort, microSD card reader, 802.11ac wireless, Bluetooth 4.0, 5-megapixel front camera, 8-megapixel rear camera, Surface Pen, and Windows 10 Professional.