When I was updating this page, then coupon price was 12.99 USD for Book Light USB LED (in Banggood). You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
Latest price update (UTC time):
Banggood (12.99 USD)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. Is it expensive? From what I can see this price is higher than average price (11.16 USD).
Link: Banggood product page
Price: 12.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BG589b2e
(probably won’t work, but you can try them out)
Aliexpress
Click here… to search for Baseus Book Light USB LED Rechargeable Clip-On Desk Lamp on Aliexpress
Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for Baseus Book Light USB LED Rechargeable Clip-On Desk Lamp.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).