…and easy to make!
http://www.ponoko.com/
the concept is simple, and an example is demonstrated here:
http://blog.makezine.com/archive/2008/09/ponokos_new_photomake_ser.html
And here’s an example item that is for sale that I like:
http://www.ponoko.com/showroom/Chromatophobic/30mm-snowflake-x3-366