Right now the best price with coupon code for ET481 1.43 inch AMOLED Smart Watch is $39.99 (in Banggood). Just check coupons out (with price alert and history). Let’s see what best price is ATM.
ET481 1.43 inch AMOLED HD Screen ECG Blood Composition Non-invasive Blood Glucose Measurement HRV Function AI Medical Diagnosis Metto SOS Emergency Call Heart Rate Blood Pressure SpO2 Monitor Sleep Monitoring Multi-sport Modes IP68 Waterproof Smart Watch – Black
Latest coupon and price update (UTC):
Banggood ($39.99)
Banggood warehouse is located in China. I can’t find any active coupons for this product in Banggood. Low/high price? Maybe there’re no more promotions for this item, because current price is higher than average (which is equal $37.66)
Link: Banggood product page
Price: $39.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG07b7a3
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for ET481 1.43 inch AMOLED Smart Watch.
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)).