Aliexpress
Click here… to search for Trustfire DF70 XPH70 Diving Flashlight on Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. Well, there is one coupon available right now.
Link: Banggood product page
Coupon (68.84 USD): 4BLF
(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): BGDF70, EYBG, BGTORCH, BGBFCR41, bGhOnEy10, bgshOOp10, BgoFErTaSchInA10, BgcLuBofErtA10, BGFLS15, BGAFF10OFF, BGCuponation10
(probably won’t work, but you can try them out)
Price history and price alert
Here is price history (for all/most countries) for Trustfire DF70 XPH70 Diving Flashlight.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).