Ebay offers Smithsonian Planetarium Projector for $14.99 (reg $29.99) with free shipping.

Product Description:
Bring the nighttime sky into your child’s room with this mesmerizing, dual-function planetarium projector. Just aim the projector at a light-colored wall or ceiling, and gaze at a rotating star pattern of the northern sky. Three disks feature 24 high-definition space images to project alongside the stars: planets, nebulae, moons, asteroids and more. The Smithsonian Planetarium Projector features a 15-minute auto-shut-off, so you can fall asleep under a magical night sky. It comes with STEM educational content and requires 3 AA batteries (not included). Ages 8+.

• Suggested Age: 8 Years and Up
• Educational Focus: Engineering, Science, Technology, Math
• Power Source: Battery
• Battery: 3 AA Alkaline, Required, Not Included