According to my DB the lowest price is $9.15 for 4pcs LED Solar Outdoor Wall Light (in Banggood). Just check coupons out (with price alert and history). What is best price?
Shell color: black shell, Package: 11.5 * 7 * 9cm/4.53*2.76*3.54inch, Lamp beads: 2 straw hat lamp beads discharge current 15mAh, Product material: PP, Battery: 1 AAA 1.2v200mAh Ni-CD battery, Model Number: Solar Lamps, Product weight: 249g/box (4pcs) / 55.5g/piece, Features: Outdoor Lighting, Solar panel: 2V/100mAh amorphous silicon, Usage: EMERGENCY, Color: white light / warm light (optional), Lighting time: 6-8h
Latest coupon and price update (UTC):
Banggood ($9.15)
Banggood warehouse is located in China. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood. The question is – is it a good price? This price is higher than average price ($8.05) for this item.
Link: Banggood product page
Price: $9.15
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG589b2e
(I don’t think these’re gonna work, but you can try ’em out anyway)
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
Do you need price history chart (for all/most countries) for 4pcs LED Solar Outdoor Wall Light? There we go.
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)).