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.