Basically copy coupon, view price history or create e-mail price alert. Let’s see what best price is ATM.
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Size 4.92×1.57×1.1inch (LxWxH), Peak beam distance 306 yards, Model TM9K TAC, Brand NITECORE, Waterproof IP68 2m submersible, Lumens 9800lm, Peak beam intensity 19800cd, LED 9x XP-L2 HD LEDs, Impact resistance 1m, Weight 7.71oz
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($140.66): BGAlerabatI
2. ($143.86): BGtorch2
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 and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG10OFFAFF1, BANGGOODSD, 6GSGIT, BGTorch4, 00c906, BGtorch3, BGAlerabat15, BGtorch7, FIN7820
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for NITECORE TM9K TAC XP-L2 HD Flashlight.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).