Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. One coupon is available. Cool!
Link: Banggood product page
Coupon (71.31 USD): BG51f436
(CouponsFromChina.com tip: you should apply the coupon in your cart 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): W8ECG, 502C6B, e2bcea, band10, aff7off, TTxBG10, 2019SPEDM, BGss506, AFfbG10, BGBK15, BGBFAFF2019, BGBAK15, BGAFF10OFF, BGSS10%SW, 7d18f7, bgshOOp10, BG11PP7, BGWRIBAND10, 6GSGIT
(these coupons are old, so probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for Bakeey W8 Smart Watch.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).