The Little Planet Factory (really, that is their name) is making a tiny Solar System In A Bottle ($37). Inside the bottle are all 8 planets of the solar system at a scale of 1:5,000,000,000. Much more manageable to carry around. Also, a great piece to keep on your desk to keep things in perspective when work seems too important.
Contains:
Jar/Cork
Mini Mercury
Mini Venus
Mini Earth
Mini Mars
Mini Jupiter
Mini Saturn
Mini Uranus
Mini Neptune