The nose-piece adaptor can be found at
Mogg Adaptors in Australia.
I reckon Steve Mogg makes the best ones. Even the Yanks buy from him.
ToUcam is a webcam made by Phillips. It has a lux rating of <1 which makes it sensitive for Astro work.
There are other brands as well, but the ToUcam seems to be the most popular and sensitive.
Telescopes and Astronomy in South Australia sells them already modded, or you can attempt to do the mod yourself (damn hard).