Microsoft Store has the Sony VAIO Duo 13 4th Generation Intel Core i5 13.3" LED Touchscreen 2-in-1 Ultrabook (SVD13223CYB) for $899 with free shipping. Converts to tablet and ultrabook with a Surf Slider hinge. Weighs 2.87 lbs and measures 0.77" thin.
Best Buy has the Sony VAIO Tap 11 4th Generation Intel Pentium Dual Core 11.6" 2-in-1 Touchscreen Laptop / Tablet, Black (SVT11213CXB) on sale for $500 with free shipping. Features a wireless magnetic keyboard, weighs 1.7 lbs. and measures 0.4" thin.