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Posted a thread about it several months ago. I'll see if I can find it again.

EDIT: Found it

http://straightrazorpalace.com/hones/82057-thuringian-usage.html

Every stone I own was purchased at flea markets, garage sales, and antique stores. I don't think more than $15 was paid for any of them either...

I got a very nice thuri from an antique store in...