Same here - I even have a small cache of the stuff in case they quit making it. That happened with Colgate Octagon soap and it's now going for ridiculous prices.
Grandpa's lasts a long time, too, yet is plenty sudsy enough. Never did like Dove, it seems to melt like an ice cube in warm water.
Grandpa’s is a helluva soap. I have even used it for shaving soap.