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I got mine here:
DMT Dia-Sharp Hone - 6"

His price went up, since the last time I checked, it's 20$ now.

Here's another resource, still at 18$, but I never bought from them:
DMT Dia-Sharp...

I have a DMT 1200 6"X2". Costs 18$ + shipping
I have many coticules, but one would suffice.:thinking: A 6"X2" costs 78$ + shipping

I have coarser DMT's , a couple of Belgian Blue Whetstones, but...