Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (35.99 USD): band10
Coupon (35.99 USD): AFfbG10
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply 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): bgpc99, TTxBG10, zeblaze10, BG3CSUM
(probably won’t work, but you can try them out)
Price history and price alert
Check out price history chart (for all/most countries) for Zeblaze PLUG C Smart Watch.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).