Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. One coupon is available. Cool!
Link: Banggood product page
Coupon (93.10 USD): BGtorch2
(CouponsFromChina.com tip: coupon code has to be applied in shop’s 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): BgcLuBofErtA10, BG1128, BGP20I, 4BLF, cbrIDgTec, BGNTP20I, BG10OFFAFF1, BANGGOODSD, BGTorch4, 00c906, BGYW93, BGtorch3, BGAlerabat15, BGtorch7
(probably won’t work, but you can try them out)
Price history and price alert
Here is price history (for all/most countries) for NITECORE P20I SST40-W Flashlight With Battery.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).