Dear Sher;-
    In "Rice's Prices", page 98, under "TYPHIS", the shell is listed
as "colemani Ponder, 1972". Rice calls it from SECen. Pac. and gives
the price as $8-$15 for SE and $20-$30 for Cen. Pac. My list is from
1995, so it could have changed. But with will give you a start.
             Art