Just check coupons out (with price alert and history). You probably want to know what is the best price?
Power: 0.5W, LED QTY: 10LED 2835smd, Solar Panel: 5V 100ma, Charging Time: 6-8 hours, Light Color: warm white, Working Time: 8 hours, Battery: 500mah, Main Material: ABS, Waterproof Grade: IP65
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 Europe 
. I’m not sure about the price, coz I have only 1 record(s) in my database. I found coupon for you. Check this out.
Link: Banggood product page
1. ($18.79): BG589b2e
paste coupon code in your cart and click Apply 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
Price history and price alert
Not enough data to show price history chart… $18.79 is the only recorded price. It was not cheaper than that since we have saved it in DB.
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)).