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 (149.99 USD): BGCL26
Coupon (236.27 USD): BANGGOODSD
(CouponsFromChina.com tip: this code has to be applied 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): 720f70, 7a3e05, 6335CK, BGLF2, AC18, CFCBG, BGMF04, BGSPS04, M4BG, BGF1111, BGBFCR40, F7BG, AXMAS, m4x2020, BGASTROLUX, BGSM30%, BGTBD, BG14TH12, BG1128, BGAST25, cbrIDgTec, BG10OFFAFF1
(there’s a little possibility that old coupon will work)
Price history and price alert
Check out price history chart (for all/most countries) for Astrolux MF04 NW Flashlight.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).