Just check coupons out (with price alert and history). What is best price?
Material: TPU, Waterproof IP67 waterproof, Charging Type: Magnetic charging, Product weight: about 74.6g, Length: about 120-220mm, Resolution: 240*204 pixels, Standby Time: About 168 hours, Width: about 26mm, Charging Time: About 2 hours, Size: 1.22inch, Type: IPS Color Display, Dial material: DLC (Drilling Carbon Coating), Battery Capacity: 180 mAh, Dial size: about 50*50*14.8 mm
Aliexpress
There’re some similar (or not) items 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.
Link: Banggood product page
1. ($36.89): band10
2. ($36.89): zeblaze10
3. ($36.89): BGZeblaze10
4. ($36.89): BGAFF10OFF
just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): e2bcea, ECG10, zbl399, bg52354, BG39ECG, 2019SPEDM, AFfbG10, 502C6B, BGBFAFF2019, BGNV3E, BGNV3ECG, BGVDay10%off, BG25ECG
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for Zeblaze VIBE 3 ECG Smart Watch.
Price records source(s): Gearbest, 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)).