American Metal Market provides price information on 1400 industrial materials.
About.com Metal prices page
A Big discussion paper on metal prices with some theoretical ideas like
Fact One: Global determinants of prices do not dominate market-specific
• Fact Two (in its simplest form): The relative price of a metal is inversely
proportional to its relative volume of production. If, for example, global
iron ore production expands 10 percent faster than the average for all
metals, then its price falls by 10 percent.
• Fact Three: Metal prices exhibit well-defined short-term cycles that tend
to repeat themselves
Relative Metal Costs - Updated with 2010 prices
Steel Price List