Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There are no active coupons for this product, but the price is pretty low isn’t it?
Link: Banggood product page
Price: -3 USD
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
Old coupons (from the oldest to the newest): BGSE11, band10, bgshOOp10, BGHALLOWEEN, BGCuponation10, BG7398, BGWRIBAND10, 6GSGIT, BG51f436, BGc70579, BGf808be, BGe6ac33, BGbf11dd
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for SENBONO S11 Fitness Tracker.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).