Go down and check coupons out. Remember to check price history if it is available. Best price?
Polymer Lithium Battery, 1200mAh, 80LM, 64 LED Lights
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.
Link: Banggood product page
1. ($24.69): 2022ACTIESNL
2. ($24.96): BG00c906
apply code in your basket (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): 935bc1, BGITBICILED, 626b9c, BRANDXS, BGXXANES, BGAYOIZ, BGAFF10OFF, BGMUBB, BG10OFFAFF, BGwhielabel, BGBICYCLES, BG4d9120, 00c906, ADMITAD2212
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Price history (for all/most countries) for XANES STL-01 Induction Safety Bicycle Taillight 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)).