Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (31.27 USD): bGhOnEy10
Coupon (31.27 USD): BGdragonBoat
(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): 502C6B, e2bcea, TTxBG10, BGss8%hl, bgssaff9, AFfbG10, BGaDmITAd, BGBFAFF2019, BGCITYADS2019, BGVDay10%off, BGLIGHT2020, BGSS10%SW
(there’s a little possibility that old coupon will work)
Price history and price alert
Do you need price history chart (for all/most countries) for Utorch 18cm Touch Control 3D Moon Night Light? There we go.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).