Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
Coupon (16.79 USD): BGWRIBAND10
(CouponsFromChina.com tip: put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): id115p, 502C6B, TTxBG10, band10, bgip2, AFfbG10, BGBK15, BGBAK15, BG11SHOP, BGCuponation10
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for Bakeey ID115 PLUS Smart Watch Black is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).