As for the Star Master..
It is indeed a cool toy. However you will discover a couple things about it that will make you scratch your head.
First of all, it has a spot for a dc adapter, though it is not included, and the obscurity of this toy would lead you to believe it is not available for purchase.
Second of all, it is not at all a rendition of the night sky. It is cool to look at, but it is just a bunch of dots with light passing through them. HOWEVER, the base of the Star Master can be turned to set the month. Couple the fact that I just said about it having nothing to do with actual stars, and the fact that there is no point of orientation even if it was accurate, will leave you just as puzzled as I.
I say buy this thing, honestly it is cool, but don’t put any thought into that rotating base, I swear it was just put there as a prank to make smart people puzzle over it!
One last note, this toy would almost double in coolness if it very slowly turned on its base, which would make the stars move and sparkle.
Have fun!