Provided by the Wall Street Journal, this website provides current day data on US stocks, international markets, ETFs, mutual funds, bonds, credit markets, commodities, futures, currencies, and earnings.
This International Monetary Fund source provides current and historical financial information on member countries. Once in the landing page, change time period, then click on "Commodity Prices". 1945- Tutorial from UIUC: http://cooper.library.uiuc.edu/bel/classes/ifs/index.phtml
From IMF's International Financial Statistics. "Indices in terms of dollars or sdrs, indices of market prices for non-fuel commodities and petroleum, actual market prices for non-fuel commodities and petroleum, and average weekly prices for non-fuel commodities and petroleum. "
U.S.Commodity Futures Trading Commission (CFTC) is an independent government agency with the mandate to regulate commodity, futures and option markets in the United States. Their web site has links to all domestic exchanges, market analysis, market surveillance, and market research.