I've owned one of these for a couple years, so I can vouch that it's worth the price. I use it all the time. My friends love it and some have purchased their own after seeing how mine works.
Note that it's just a projector and it doesn't display lights based on constellations.
The one downside is that it is kind of loud, but if you're playing music, it's fine.
Turfly
Where can I find an iPhone 7?
Loot Market