MobilePros1 via eBay offers the refurbished Motorola Moto 360 Android Sport Smartwatch in Black for $79.99 with free shipping. That's $110 under the lowest total price we could find for a new first-generation watch in any style. It's compatible with devices running Android 4.3 OS or higher and features a backlit 320x290 touchscreen LCD with Corning Gorilla Glass 3, 4GB internal memory, mobile notifications, 802.11g wireless, Bluetooth 4.0, and voice control.

Note that no warranty information is provided. The product page states this is both a 44mm and 46mm size in different locations; it is unclear which size it accurate.