Microsoft Store offers the 3.9-lb. ASUS Transformer Book Flip Signature Edition Haswell Core i5 1.7GHz 13.3" 1080p Convertible Touchscreen Laptop, model no. TP300LA-UB52T, for $599 with free shipping. (Click "PC only" to see this price.) That's $200 off and tied with last week's mention as the lowest total price we've seen. It converts into a touchscreen tablet and features an Intel Haswell Core i5-4210U 1.7GHz dual-core processor, 13.3" 1920x1080 (1080p) LED-backlit touchscreen LCD, 8GB RAM, 500GB hard drive, 802.11n wireless, webcam, Bluetooth, 3-cell battery, and Windows 8.1 64-bit. (No optical drive is included.)

Note: It will not arrive in time for Christmas.