Amazon has the LEMFO LF19 IP68 Waterproof 5ATM Digital Men’s Sport Smart Watch for $29 - $10 off with coupon code 6T4UEX3P [Exp 1/15] = $19 with free shipping on $25+ or with Prime.

Features 1.12" display, 18mm band, Bluetooth push notifications, iOS/Android compatibility and uses a standard replaceable CR2430 battery.