You can create price alert here, copy coupons and view price history. You probably want to know what is the best price?
Waterproof 5ATM, Charging Time: About 2 hours, Bluetooth Version BT5.0, Charging Type: Magnetic charging, Battery Capacity: 260mAh, Type: TFT, Using time: About 15 days, Size: 1.3inch, Resolution: 240*240pixels, Standby Time: About 30 days
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 and price update (UTC):
Banggood
Banggood warehouse is located in Hong Kong.
Link: Banggood product page
1. ($50.39): band10
2. ($50.99): 7d18f7
apply code in your basket (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): BGUMGT, BGBFAFF2019, BGNAUMGT, BGPro19, AFfbG10, BGUwatchGT, BGUmidigiGT, BGBGAFF10OFF, BGUWGT, BGUM39, bgshOOp10, BG11SHOP
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Price history (for all/most countries) for UMIDIGI Uwatch GT BT5.0 47mm Smart Watch is here.
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)).