I use the services of Rochester Piano Key.  Robert Byrnes is a very
pleasant man and his services are reasonably priced.  He offers two
thicknesses of plastic.  His address is

  Rochester Piano Key, 55 Lois Street, Rochester, NY 14606

Does anyone have any information about the new key tops that are supposed
to be as good as real ivory?

Musically,
John A. Tuttle