Aliexpress
Click here… to search for MecArmy PT80 Flashlight on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. I found coupon for you. Check this out.
Link: Banggood product page
Coupon (397.66 USD): BG10OFFAFF1
(CouponsFromChina.com tip: put item in your cart and apply coupon code there 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): 502C6B, linepayflt, EYBG, BGTORCH, BGBFCR41, bGhOnEy10, bgshOOp10, BgoFErTaSchInA10, BGHALLOWEEN, BgcLuBofErtA10, BGFLS15, BGAFF10OFF, BGCuponation10, 4BLF, BGHONEY2110, BG10OFFAFF, BGwhielabel, BGflashlight
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for MecArmy PT80 Flashlight.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).