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 (368.00 USD): BGAUGUST8
Coupon (376.00 USD): BG589b2e
(CouponsFromChina.com tip: apply code in your basket (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): BGtorch2, BGtorch3, BGOutlight10, BGMARCHSALE, BGBLF06
(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 Weltool W5 2807m 699lm LEP Flashlight With Battery is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).