You can locate chemical prices from these journals and resources:
Access recommended books, journals, databases and websites for your assignments and research in chemical engineering, including bioengineering, energy, water, environment, materials, metallurgy, petroleum and processing.
Your liaison librarian can provide expert advice for your subject:
Referencing guides - guides to citing articles and books
How to find International and Australian Standards
How to find Patents
How to find articles relating to chemical engineering topics in News and newspapers