You can create price alert here, copy coupons and view price history. What is best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
APP Name YFit, Music Control Support(Can display song title), Type: IPS, Using time: About 7 days, Resolution: 320*320, Standby Time: About 15 days, Waterproof IP68, Bluetooth Version BT 5.0, Battery Capacity: 180mAh, Customized Watch Face Support, Charging Time: About 2 hours, Charging Type: Charging Clip, Size: 1.4 inch
Banggood
Banggood warehouse is located in China. Only one coupon available!
Link: Banggood product page
1. ($27.51): BGbf11dd
this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGKPM2, BGCZM2, band10, BGCuponation10, BGKOSM2, BGWRIBAND10, BG9c96ae, 6GSGIT, BG51f436
(these coupons are old, so probably won’t work)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – Kospet M2 Fitness Tracker [EU] ($-3)
Price history and price alert
Here is price history (for all/most countries) for Kospet M2 Fitness Tracker.
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)).