Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (43.90 USD): FIN8068
Coupon (46.93 USD): BGAlerabatI
Coupon (48.00 USD): BGtorch2
(CouponsFromChina.com tip: put item in your cart and apply coupon code there 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): BG10OFFAFF1, FIN1881, BGCLV2, BGCETV2, BANGGOODSD, BGTorch4, 00c906, BGtorch3, BGAlerabat15, FIN2970, BGtorch7
(these coupons are old, so probably won’t work)
Price history and price alert
Price history (for all/most countries) for NIWALKER ETmini V2 Flashlight is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).