Deep in the jungles in Peru, there is an isolated leper colony operated by a Buddhist monastery. To get there, you have to take at least one helicopter, and then after it lands, your looking at hiking through 30 Km of near virginal jungle. In this leper colony, they harvest jade which has the unusual property of being perfectly uniformly dense and free of impurities. They hand carve it into simple geometic forms, and use modern technology to ensure perfect symetry. They usually sell these jade items to other Buddhist monks. But for only a little extra, they will sell them to anyone.
Failing that, I settle for going to the most convenient gaming store and buying a standard 'tube' of dice with one each and an extra 2d6.
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