Hi Larry,  It might be worth your time to call Bob Byrnes, owner of
Rochester Piano Keys.  His number is 716-647-1933.  Bob is a really nice
guy and on one particular job, he sent me over two hundred ivory heads so
that I could hand select 20+ for replacements on a job I was doing for a
customer who demanded ivory over plastic.

His charge for each piece I took was about $0.50 or $0.75 ea. (very
reasonable) and the end result was fantastic.  I used my standard
procedure, for mounting the replacements, which I wrote down in an
article within the past 4 months.

John A. Tuttle