$7.22 – 5V 400mA Solar Panel 2W (Banggood, Aliexpress: Working voltage: 5V, Working current: 0-400mA, Process: EVA lamination, Output power: 2W, Output port: USB, Product size: 157 * 94mm, Wafer: class A polysilicon, Conversion efficiency: 18.8%, USB cable length: 50cm (the best price with coupon)).
ATM you can buy 5V 400mA Solar Panel 2W for $7.22 (in Banggood). Basically copy coupon, view price history or create e-mail price alert. Do you want to know what the best price is?
Latest price update (UTC time):
Banggood ($7.22)
Banggood warehouse is located in China. There are no coupons available at this moment in Banggood. What about the price? According to my database, the average price is $7.30 and current price is $7.22, so it’s probably a good price!
Link: Banggood product page
Price: $7.22
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG589b2e
(these coupons are old, so probably won’t work)
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
Price history (for all/most countries) for 5V 400mA Solar Panel 2W is here. The lowest price was: $7.16.
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)).