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I had a hard time finding them too. I found them here Naguras & Fingerstones. It doesn't look like he has much left...but the nagura sold there are the authentic ones since they have that Aasano...

From what I've read a slurry created with a Botan nagura can be aggressive enough to set a bevel. I recently purchases a Botan, but haven't really tested it since I don't have any razors in need of...