Geekdeal via eBay offers the refurbished 3.4-lb. Dell XPS 12 Intel Haswell Core i5 1.6GHz 1080p 12.5" Touchscreen Convertible Ultrabook, model no. XPSU12-4668CRBFB, for $549.99 with free shipping. That's $50 under our May refurb mention and the lowest total price we've seen for this tablet. (It's also a current price low for a similar new model by $180.) It transitions into a tablet and features an Intel Core i5-4200U 1.6GHz Haswell dual-core processor, 12.5" 1920x1080 (1080p) touchscreen LCD with Corning Gorilla Glass, 4GB RAM, 128GB SSD, 802.11ac wireless, Bluetooth, webcam, 6-cell battery, and Windows 8 64-bit. (It does not include an optical drive.)

A 90-day warranty is applied, although it's unclear who backs it.