Aliexpress
Click here… to search for WAINLIGHT BD03 XPL HI 6500K 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 (21.99 USD): BGAlerabatI
Coupon (22.49 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, FIN9722, BANGGOODSD, BGTorch4, 00c906, BGtorch3, BGAlerabat15, BGtorch7
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Price history (for all/most countries) for WAINLIGHT BD03 XPL HI 6500K Flashlight is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).