I've written here before about Theo Jansen's marvellous walking mechanical Strandbeests (and the glorious hamster-powered version). Now Jansen's set up shop on Shapeways, the 3D printing place, and he's selling 3D printed versions of the eerie walkers for $105.
Designing the Beests this way proved quite the challenge. They consist of at least 76 separate moving interlocking parts. Multiple prototypes were used to come to the first viable solution, "Animaris Geneticus Parvus" #5. But the evolution process continues with evolutions #6 with lightweight bone structure and #7 with pointy feet.