Refurb for Less via eBay offers the refurbished 5.3-lb. HP Envy x360 Intel Haswell Core i7 2GHz 15.6" 1080p Convertible Touchscreen Laptop in Natural Silver, model no. G6T85UA#ABA, for $604.99 with free shipping. That's $95 under our January mention of a new unit and the lowest total price we've seen. (It's $45 less than a new unit today.) It features an Intel Core i7-4510U 2GHz Haswell dual-core processor, 15.6" 1920x1080 (1080p) touchscreen LCD, 8GB RAM, 1TB hard drive, webcam, Bluetooth, USB 3.0, 802.11ac wireless, and Windows 8.1 64-bit.
A 90-day warranty applies, although it's unclear who supports it.