Go down and check coupons out. Remember to check price history if it is available. Do you want to know what the best price is?
SOLMORE LED Starry Sky Projector Star Lamp Built-in Music Player Night Light Starry Sky with Remote Control White Noise Starlight and Water Waves for Room Party – Black
Aliexpress
I could not find it on Aliexpress. 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 Europe 
. Hmmm… There is no active coupon in Banggood at this moment. I don’t really know if this price is reasonable, coz there’s no price history in my DB.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG611021, BG589b2e, BGProjcc
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
It doesn’t make sense to generate price history chart, because there is one price record which is: $17.99.
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)).