Xiaomi FH100 Headlamp (Banggood, Aliexpress: medium bright 3h, Input 5V 500mA Operating temperature -20-50℃ Storage temperature -10-35℃ Power interface Micro-USB Waterproof IP45 Angle adjustment Support three-angle adjustment Illumination brightness Low light 17h, highlight 1.3h Lumen 105LM Type of light source LED Color Red Size 48x 28x 32mm / 1.89x 1.10x 1.26inch Weight 27g (the best price with coupon)).
Just check coupons out (with price alert and history). What is the 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 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
1. ($27.93): 13f142
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): 2be6e9, 935bc1, plxmnl, 0e7f33, FBCOUPON1, BGAFF10OFF, BGCuponation10
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Here is price history (for all/most countries) for Xiaomi FH100 Headlamp. The lowest price was: $16.59.
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)).