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Tandy leather is also a good source for materials and tools.

Surf his other wares and bet you buy sumptin. I know I like my strop (Kanayama#3)and razor case I purchased.
Nod to Phrank for leading me to that link in the first place. :chapeau
Cheers

I don't have the link anymore sadly, but there is a japanese seller who sells kanayama's and also sells the actual swivels he uses as well separately.
Will try to find the link and post.
Good luck....