Aliexpress
Click here… to search for Astrolux S43S Copper Flashlight With Samsung 30Q 20A on 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 (37.72 USD): BGASTB
Coupon (41.49 USD): BGTorch4
(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): BGS43SCE, EYBG, BGTORCH, BGF1111, BGBF19, FA3459, AXMAS, BGASTROLUX, BGSM30%, BGTBD, BG1128, BGAST25, BG10OFFAFF1, BANGGOODSD
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Here is price history (for all/most countries) for Astrolux S43S Copper Flashlight With Samsung 30Q 20A.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).