Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. CouponsFromChina software could not find any coupon for this product in Banggood.
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): BGT4, band10, BG3CSUM, AFfbG10, BGBK15, 0e7f33, BGBAK15, BGCuponation10, BGWRIBAND10, 6GSGIT, BG51f436, BGc70579, BGbf11dd, BG284c49
(these coupons are old, so probably won’t work)
Price history and price alert
Price history (for all/most countries) for Bakeey T4 Smart Watch is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).