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Not knowing the source is enough to keep me from buying a stone. I don't have anything that I couldn't locate the source of and I'd hesitate to count the number of stones I've bought. It's a matter...

I remember when those showed up on ebay for $10 or something. Now they're $50 and $90?

And in the demo video, the stones show to have a bunch of stiction - coupled with a completely offputting...