K.B.
Check out amazon.com. They have a lot of different products at various prices. Of course, the ones with the best reviews are around $100. I think the customer reviews on amazon are very helpful. It probably would work best in a totally dark room. Do you have a theater room? I also agree with taking your daughter to some real planetariums like at Fair Park and Richland College, as well at UT Arlington. I am assuming she must have been to some planetarium to even know to ask for one. When my son was about that age, we bought the glow in dark stars and put them all over the ceiling in his bedroom. He loved it!