According to my DB the lowest price is $14.99 for USB Rechargeable Table Lamp With Clip 4000mAh (in Banggood). Go down and check coupons out. Remember to check price history if it is available. Best price?
Battery Capacity: 4000mAh, Voltage: 5V 1A, Material: ABS+PP, Color Temperature: 4500K, Power Supply: USB Rechargeable, Brightness Adjustable: Yes / 3 Levels of Brightness
Latest coupon code price check (UTC time):
Banggood ($14.99)
Banggood warehouse is located in China. I couldn’t find any coupon for this product on latest product update. Price? From what I can see this price is higher than average price ($9.99).
Link: Banggood product page
Price: $14.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG589b2e
(there’s a little possibility that old coupon will 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 USB Rechargeable Table Lamp With Clip 4000mAh is here.
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)).