$26.50 – Process Laminated Sanding Board, Packaging Box Specifications 200*140*40mm, Current 0-2.4A, Conversion Rate 19%, Folding Size 170 * 120 * 30mm, Weight 400g（With Packaging Box）, Product Name 15W Solar Foldable Panel, Waterproof Grade IPX6, Output Voltage 5V, Unfolded Size 790 * 165mm, Output Interface Dual USB, Chip A-grade Polycrystalline Silicon.
You can get 5V 15W USB Solar Panel for $26.5 using coupon code (in Banggood). You can create price alert here, copy coupons and view price history. Do you want to know what the best price is?
Latest price update (UTC time):
Banggood ($26.50)
Banggood warehouse is located in China. What about the price? Well, this price is higher than average price ($26.07) I am tired of searching coupons, but I found one for you…
Link: Banggood product page
Price without coupon: $27.89
1. ($26.50): BGCAMP5
paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BG589b2e
(probably won’t work, but you can try them out)
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for 5V 15W USB Solar Panel. The lowest price was: $23.99.
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)).