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 (129.99 USD): BGL9129
Coupon (134.99 USD): bgwp
Coupon (134.99 USD): LEM10
Coupon (139.49 USD): PICODICOM
(CouponsFromChina.com tip: coupon code has to be applied in shop’s 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): LEM149, quad35, 502C6B, e2bcea, lemfo10, TTxBG10, aff7off, BG3CSUM
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Price history (for all/most countries) for LEMFO LEM9 1/16GB Smart Watch is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).