ICC the world business organization:
http://www.iccwbo.org/
London Metal Exchange
http://www.lme.co.uk/
The World Bank Commodity Price Data (Pink Sheet):
http://econ.worldbank.org/WBSITE/EXTERNAL/EXTDEC/EXTDECPROSPECTS/ 0,,contentMDK:21148472~menuPK:476941~pagePK:64165401~piPK:64165026~theSitePK:476883,00.html