Tools from Japan used to be the place to buy the Suehiro Gokumyo 20k but they are no longer selling. Where do y'all go for this stone now? I tried buying from the company's webshop, https://www.suehiro-toishi.com/en/gokumyo/hdk-8s/#, but I could not create a Yahoo - Japan login id. It would not accept my cel number.