I finished my puck today. I think it was a mistake to grate it down when I started, as towards the end the little that was left becomes so crumbly that I was getting a lot of chunks in the lather.
Other than that it was a great experience and I'm bummed I don't have more, Williams really agreed with my skin.
I might try to search more out, though I think it's harder to find here. How do I tell the vintage stuff from new looking at the package?