According to my DB the lowest price is 13.02 USD for 108 COB Solar Light (in Banggood). Price history, coupons and price alert are available on this page. Best price?
Latest price update (UTC time):
Banggood (13.02 USD)
Banggood warehouse is located in China. I couldn’t find any coupon for this product on latest product update. Low/high price? Cool, average is 13.67 USD, so current price is lower!
Link: Banggood product page
Price: 13.02 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BG589b2e, BGc28268, BG9dce6b
(I don’t think these’re gonna work, but you can try ’em out anyway)
Aliexpress
Click here… to search for 108 COB Solar Light on Aliexpress
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for 108 COB Solar Light.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).