Re:truffles - Wikipedia says "Eighty percent of the truffles now produced in France come from specially planted truffle-fields. Nonetheless, production has yet to recover its 1900s peaks. Local farmers are opposed to a return of mass production, which would decrease the price of truffles. There are now truffle-growing areas in the US, Spain, Sweden, New Zealand, Australia, Chile and the UK." So you might be ok unless you're buying the insanely expensive ones.
ETA: Actually, have just found this, also Wikipedia -
Truffle oil is often used as a lower cost and convenient substitute for truffles, to provide flavouring or to enhance the flavour and aroma of truffles in cooking. Most "truffle oil" however, does not contain any truffles.The vast majority is olive oil which has been artificially flavoured using a synthetic agent such as 2,4-dithiapentane. Daniel Patterson reported in the New York Times that "even now, you will find chefs who are surprised to hear that truffle oil does not actually come from real truffles." Many chefs continue to use inexpensive synthetic truffle oil, considering it to be "a reasonable substitute."
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