ET381 1.43inch AMOLED Display ECG Heart Rate Blood Glucose Blood Lipid Measurement bluetooth Call Blood Pressure Blood Oxygen Monitor Uric Acid SOS Emergency Call Sleep Monitoring Multi-sport Modes Music Playback IP67 Waterproof Smart Watch – Black Steel.
Go down and check coupons out. Remember to check price history if it is available. Let’s see what best price is ATM.
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Additional Banggood coupons: first page and second page
Price history and price alert
Check out price history chart (for all/most countries) for ET381 1.43inch AMOLED ECG Smart Watch. The lowest price was: $24.99.
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)).