Leonard Caillouet wrote:
The outer lens is the lenticular, the inner is the fresnel. Call
your local shops or Toshiba distributors with the model number.
Expect to pay at least a couple hundred $ for it. If you measure the
exact dimensions of the screen from behind you might get lucky and a
local shop will have one the right size or one that they can cut to
fit for cheap.

FWIW, replacing the lenticular is not as easy as you might think. The
lenticular screen is attached to the fresnel screen in a specific way so
that the fresnel screen is allowed to hang freely, which prevents it
from bowing. It's very easy to get small bits of debris in between these
two screens when assembling them, which can make visible shadows on the
screen.