Basically copy coupon, view price history or create e-mail price alert. You probably want to know what is the best price?
Color temperature: 3000K, Lumen: 50lm, Battery: built-in 600mAh Li-ion battery
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest price update (UTC time):
Price history and price alert
Here is price history (for all/most countries) for Utorch Smart Sensor Night Light 3000K.
Price records source(s): Gearbest
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)).