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Free Historical Commodity Prices in txt?
At indexmundi, they have some historical data which you can grab from their charts: It only has a price on a monthly basis (at least for the 25 year chart). It has a number of things, like barley, oranges, crude oil, aluminum, beef,  etc.    I grabbed the data for 25 years of banana prices and here's an excerpt (in dollars per metric ton): That page did not appear to have historical prices for gold, though.