Aliexpress
Click here… to search for BORUiT M52 XHP50 Diving Flashlight 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 (35.33 USD): bGhOnEy10
Coupon (35.33 USD): BGTORCH
(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): b0bf2e, BGM52, linepayflt, EYBG, 502C6B, BGBFCR41, bgshOOp10
(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 BORUiT M52 XHP50 Diving Flashlight.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).