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You can get the artificial Nagura stones pretty much anywhere that sells sharpening stones. I bought mine from Woodcraft.com Buy Nagura Stone 7 8 x 7 8 x 3 at Woodcraft

The norton prep stone or the norton flattening stone? The flattening stone is pointless if you've already got a dmt 325.

If you meant the little slurry stone, like an artificial nagura, then I'd...