You can create price alert here, copy coupons and view price history. You probably want to know what is the best price?
Type: IPS, Charging Time: About 2hours, Product Weight: about 66g, Resolution: 240*240pixels, Band Size: about 22mm, Compatible OS Android 5.0 or above, Temperature Monitor Support, Model GW16T, Bluetooth Version BT 5.0, Standby Time: About 15days, Using time: About 5days, iOS 8.0 or above, Operating Mode Touch Screen, Battery Capacity: 220mAh, Waterproof IP67, Charging Type: Dock charging, APP Name Wearfit 2.0, Dial Size: about 52mm, Size: 1.28inch
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 China. There is no active coupon in my database right now (for Banggood).
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!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): band10, bgshOOp10, BG11SHOP, BGCuponation10, BGWRIBAND10
(probably won’t work, but you can try them out)
Price history and price alert
Do you need price history chart (for all/most countries) for KUMI GW16T Fitness Tracker? There we go.
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)).