Aliexpress
Click here… to search for SEEKNITE D236 SST40 Flashlight on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. There is one coupon right now! Check this out.
Link: Banggood product page
Coupon (24.99 USD): FIN1556
(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, BANGGOODSD, 6GSGIT, BGTorch4
(probably won’t work, but you can try them out)
Price history and price alert
Here is price history (for all/most countries) for SEEKNITE D236 SST40 Flashlight.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).