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 (24.69 USD): FIN1892
Coupon (25.10 USD): BGOutlight10
Coupon (25.95 USD): Cuponation9
Coupon (26.24 USD): BG8ReviTrage
Coupon (26.81 USD): BG00c906
(CouponsFromChina.com tip: just apply this code 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): BG10OFFAFF1, FNMHA23, FNTHA23, BG4d9120, 00c906, ADMITAD2212, 2022ACTIESNL, Terence, Tabby20, 2203ActiesNL, BG1efeb0, 8Couponsde, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BG71c041, hoNEYbGdeAlS, BGbhlight01
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for NITECORE HA23-Ex XPG Headlight.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).