According to my DB the lowest price is $17.99 for BIKIGHT 2800lm Bike Headlight 6600mAh (in Banggood). You can create price alert here, copy coupons and view price history. You probably want to know what is the best price?
BIKIGHT 2800Lm Super Brightness Bike Headlight 6600mAh Battery Anti-glare Design Waterproof 5 Light Modes Type-C Fast Charge Aluminum Alloy Bicycle Front Light
Latest coupon and price update (UTC):
Banggood ($17.99)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. You probably want to know if this is a good price. IMHO this is a good price, coz it’s lower than average ($18.32)
Link: Banggood product page
Price: $17.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
There were country-specific coupon codes published on Couponsfromchina social channels and price alerts. Coupon price may vary by country, because there’re different VAT rates, shipping cost etc. There is a chance that some latest coupons are still working:
1. (1.7.2024, $16.99): BGHUBIK20
Item: BIKIGHT 2800lm Bike Headlight 6600mAh
Countries: CzechRepublic, Hungary, Slovakia(SlovakRepublic), Slovenia
Old coupons (from the oldest to the newest): BGTYJE47
(probably won’t work, but you can try them out)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for BIKIGHT 2800lm Bike Headlight 6600mAh 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)).