You can still find 'em. Just google "Gosen Sorbothane grip".
I've never heard of the "Zorbicon gel" in the Gamma grips, or of any viscoelastic that acts like Sorbothane. (That stuff must have been salvaged from a crashed flying saucer.) The low price ($5, vs. $20 for new-old stock of Gosen Sorbothane) is of interest. Any reports on how heavy it is or how it feels?
EDIT: A search reveals some posts on the Gamma grips, and it sounds like a lite version of Sorbothane that adds about half the additional weight and, presumably, offers maybe half the shock absorption.
In my youth I was addicted to The Hokey Pokey, but I turned myself around.
Last edited by Don't Let It Bounce : 11-18-2009 at 04:26 PM.