Battery 1x 18650 battery pack (8x 18650 3400mAh), Head diameter 75mm / 2.95inch, Max output 9600 lumens, LED 16x XP-G2, Body diameter 52mm / 2.05inch, Weight 534g, Reflector Optical lens, Length 192mm / 7.56inch, Max beam distance 415m, Max run time 622h, Max beam intensity 43238cd.
Price history, coupons and price alert are available on this page. Best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. There is one great coupon!
Link: Banggood product page
1. ($397.66): BG10OFFAFF1
this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
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
(probably won’t work, but you can try them out)
Price history and price alert
Check out price history chart (for all/most countries) for MecArmy PT80 Flashlight. The lowest price was: $278.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).