I remeber finding this a while ago, just looks like a fantastic material. A friend of mine is going to central america soon, I'll see if they can send me some back. Thought you guys might like a look. I can see it making great bolsters and bits, if not full handles as well as some beautiful carvings.
http://www.oneworldprojects.com/products/tagua.shtml - sell the raw nuts bye the sack sorry....
ooh, and just found this