Found these Astro Boy key chains awhile back, but I don't remember where. They seem to come from China. Your guess is as good as mine as to whether they are officially licensed merchandise or not.
Astro's face is... unique, to say the least. His eyes look kind of funny. But that makes these kind of interesting. The variety of available figures based on Astro's different appearances in the movie is pretty cool.
This site is dedicated to everything Astro Boy, the works of Osamu Tezuka, and other related anime & manga. Whether you're an old-school fan, a newcomer, or anything in between, AstroBoy World is bound to offer something interesting for you.