Expansys offers the Sony SmartWatch 3 for Android Devices, model no. SWR50, for $249.99 with free shipping. That's a $50 savings and the lowest total price we could find. This model is compatible with most devices running Android 4.3 or later. It features a 1.6" 320x320 touchscreen LCD, up to 2-day use on one charge, microUSB, and Bluetooth 4.0.
Of note, Keystone West via Amazon charges the same as above, but has a November 20 release date.