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 (30.00 USD): FIN7904
Coupon (33.44 USD): BGAlerabatI
Coupon (34.20 USD): BGtorch2
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply 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, FIN2785, F47904, BANGGOODSD, BGTorch4, BGdeals326, 00c906, BGtorch3, BGAlerabat15, BGtorch7
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Here is price history (for all/most countries) for ReyLight Nichia 219B Flashlight.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).