eTechGalaxy via eBay offers the open-box 4.8-lb. Dell Inspiron 15 7000 Series 7568 Intel Skylake Core i7 2.5GHz 15.6" 4K Ultra HD Touchscreen 2-in-1 Laptop in Black for $649.99 with free shipping. That's $10 under our mention of an open-box unit from last week and the lowest price we've seen. (It's also at least $75 less than you'd pay for a factory-sealed unit.) It functions as a laptop or tablet and features an Intel Core i7-6500U 2.5GHz Skylake dual-core processor, 15.6" 3840x2160 (4K 2160p) LED-backlit touchscreen LCD, 8GB RAM, 256GB SSD, 802.11ac wireless, Bluetooth 4.0, backlit keyboard, HDMI, USB 3.0, 3-cell battery, McAfee 12-month subscription, and Windows 10 Home 64-bit.
Note: No warranty information is provided.