Charging Port Type Type-C, Color White/Grey, Size 275*35*37mm, Brand YEELIGHT, Luminous Flux 120-200lm, Color Temperature 4000K±500K, Rated Input 5V DC/0.5A, Weight 250g, Rated Power 4W (Under rated input voltage conditions), Battery 2000mAH, Color Rendering Index Ra>80.
You can create price alert here, copy coupons and view price history. What is the best price?
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.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
1. ($19.54): BGYEELIGHT21
you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Price history and price alert
Here is price history (for all/most countries) for YEELIGHT A27 Sensor Night Light. The lowest price was: $19.54.
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)).