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 (111.18 USD): BGtorch2
Coupon (115.00 USD): FIN9194
(CouponsFromChina.com tip: you should apply the coupon 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): BGTM9K, BRANDNC, BGTORCH, cbrIDgTec, BG1128, BG10OFFAFF1, BANGGOODSD, 6GSGIT, BGTorch4, BGtorch3, BGAlerabat15, BGtorch7, F27325
(these coupons are old, so probably won’t work)
Price history and price alert
Price history (for all/most countries) for Nitecore TM9K XP-L HD V6 Flashlight With 21700 Battery is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).