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Carba-Tec are out of stock of the C12K right now (Aug 1st) but tell me they should have some more in this week some time. (I screwed up my order, so they rang me and we had a bit of a chat. Seem...

You can also get stones from Carba-Tec. They have branches in a few places.
Do yourself a favour and read like crazy before touching a razor to a hone. Also look into getting one honed by someone...