Piano keys are another source of ivory for small projects. Find an old piano that someone scrapped and pry the ivory off of it. I did that once and still have a small stash of it which I jealously guard because I use it to scrimshaw my name onto when I make little plaques for on projects I build.

"You can lead a man to logic, but you cannot make him think." Joe Harz
"Always certain, often right." Keith McCafferty