Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (32.55 USD): BGAlerabatI
Coupon (33.29 USD): BGtorch2
(CouponsFromChina.com tip: this code has to be applied 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): M3029, BgcLuBofErtA10, BG1128, FIN9692, 4BLF, FIN2692, BG10OFFAFF1, BANGGOODSD, BGTorch4, 00c906, BGtorch3, BGtorch7
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Price history (for all/most countries) for SEEKNITE H1 XML 5000K Headlamp is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).