Aliexpress
Click here… to search for AMBOTHER 4Pcs 8LED 3000K Waterproof Garden Solar Light [EU] on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Europe 
. I don’t want to misguide you about the price. I don’t know if it’s good, because I don’t have enough records in my database… Well, there is one coupon available right now.
Link: Banggood product page
Coupon (16.37 USD): BG589b2e
(CouponsFromChina.com tip: you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, BGf94f14, BGLED2206, TTSUMMER8, Cuponation9, BGLED07, BG00c906, BGOct22LED, BGLEDNOV2022
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
It doesn’t make sense to generate price history chart, because there is one price record which is: 12.99 USD.
You can set price alert (for Banggood).