YK02 1.43inch HD Screen bluetooth Call Non-invasive Blood Glucose Measurement HRV Metto Function Heart Rate Blood Pressure SpO2 Monitor Music Playback Multi-sport Modes IP67 Waterproof Smart Watch – Blue.
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Updated:
Banggood
Warehouse in China.
Link: YK02 1.43inch Bluetooth Smart Watch
$13.99 with coupon: BGcc2185
Additional Banggood coupons:
1. First page
2. Second page
Price history and price alert
Here is price history (for all/most countries) for YK02 1.43inch Bluetooth Smart Watch. The lowest price was: $13.99.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).