Monocycle designs

I am an Industrial designer interested in developing monocycles like these <A
HREF=“http://www.unicycling.org/unicycling/whatsnew.html”>What’s new on the
Unicycle Page</A> and<A
HREF=“http://nzuni.spectacle.co.nz/mono2.jpg”>mono2.jpg</A> does anyone have
other pictures, drawings or names of manufaturers or any other info?
Thanks…Andrew