Help in finding materials

[gothic-lolita.livejournal.com]

Hey everyone, I joined this community a while ago, and I have a question.
I want to make this doll:
http://www2d.biglobe.ne.jp/~dhnoah/make_00.htm
but I do not know where to get sawdust or "stoneclay". Any help in finding these will be appreciated.

Thank you!