Just check coupons out (with price alert and history). What is the best price?
Switch type Tactical tail switch (rated for 50 /000 presses), Radiant intensity 1150mW/sr, Waterproof IP67, Beam distance 597yards, Radiant flux 2000mW, Run Time 70 mins, Weight(±0.5g) 150g, Battery 1*18350 3.7V Li-ion rechargeable battery (included), Reflective system Aluminum alloy reflector, Size(±0.5mm) (head diameter)32.5mm / (length)118mm, Light source 1*850nm infrared LED, Material Aviation aluminum / anodized surface, Color Black/Coffee
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. Coupons for WELTOOL W35IRH Helmet Flashlight? Nope, there’re no coupons in Banggood.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGTorch4, 00c906
(probably won’t work, but you can try them out)
Price history and price alert
Price history (for all/most countries) for WELTOOL W35IRH Helmet Flashlight is here.
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)).