Camden Market, London is full of far too much facinating stuff of all descriptions, and the Village Games shop where I bought my very own "Magic Dice" at the wonderful in is no exception. They do a fine line in Klein Bottles as well.

Apparently casinos retire dice after about 8 hours of use. Paramountzone will then flog them to you. Useful props for discussing independent events - suppose that just before retirement these dice won a million for the last person to throw them...does that make them "lucky"? If so I doubt paramount wold sell them on so cheaply......

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Useful props for discussing subjective probabilities. One die is obviously loaded but until students feel the wieight difference for themselves they will most probably expect the die to be fair. So dont be put off by the silly name of the site that sells these loaded dice.