You can create price alert here, copy coupons and view price history. Best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
000 lm, Firmware Tom E’s open-source NarsilM v1.3 adapted by Texas_Ace, Emitter 3x XHP70.2 LED, Ingress rating Equivalent to IP65, Texas Avenger V2, do not immerse in liquids, orange finish, Button Tactile with back-lit rubber boot, neutral white or cool white, aluminum, Lens Glass with anti-reflective coating, Body Aluminum with Type III hard-coat anodizing, Weight Approximately 475g without cells, Driver 12V, mounted on copper DTP MCPCB, Intensity >85.6 kcd (ANSI throw >585 m), Dimensions 68 mm Ø headx 130 mm length, Tripod socket Standard 1/4 inch threaded (1/4-20 UNC), Flux >18, Reflector 62 mm inner diameter, Battery 4 button-top unprotected 18650 cells . Cells are not included.
Banggood
Banggood warehouse is located in China. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
1. ($138.13): BGALL8
apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGTT10, BGLMTB, BG1128, cbrIDgTec, BG10OFFAFF1, BANGGOODSD, 6GSGIT, BGTorch4
(these coupons are old, so probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for LUMINTOP GT3 XHP70.2 Flashlight.
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)).