Answer: 

Prices for commodities such as agricultural products, chemicals, petroleum products, and metals are often available via exchange data. When a commodity is not traded on an open exchange (often the case with specialty chemicals), trade journals are a good source of price data.

  • Datastream has good coverage of historical spot commodity prices worldwide, as well as some futures and options data (including expired options for 1-3 years).
  • Bloomberg has a wide variety of data available for the commodity markets, including current market monitors historical data.
  • The CRB Commodity Yearbook is produced by the Commodity Research Bureau and provides an overview (including prices) of a wide range of commodities.

See also: Guide to finding chemical prices for CHEME 4620.