For artists and collectors sponsored by Intercal...your mohair supplier and Johnna's Mohair Store
I came across this source for kapok and remembered Michel had been looking for a source. I have been dealing with this company for years and have found them very good. Here's the link;
http://www.feltpro.net/page4.html
The kapok is about $30. per 10 lb. pack MORE than the natural cotton - not sure how this compares.
Hope this helps someone out.
Laurie