Ebay offers Amazfit GTS 2 Mini 39mm Smartwatch for $70 (reg $99.99) with free shipping.

Product Description:
Amazfit GTS 2 mini health and fitness smart watch with super-light and thin design. Battery life of 14 days, 70+ sports modes, SpO2 level measurement and heart rate, sleep and stress level monitoring for Android and IOS devices.
Features

• Heart rate monitoring
• Sleep monitoring
• Over 70 sport modes
• Model: W2018OV1N