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These are some other sources, including databases for chemical and material suppliers, where you may be able to get current and/or historical pricing information on your chemicals. Some suppliers list prices for smaller units (grams/milligrams, liters/milliliters, etc.) on their websites, while bulk pricing is only available by contacting the supplier for a quote.
From the chemical substance (CAS Registry) record, you can find commercial suppliers, which you can customize to see preferred vendors first. Other information included: purity, stock status and shipping times. There may be some pricing, but more often there's a link back to the original supplier catalog where you can check prices. Suppliers that offer bulk quantities are indicated, but you usually have to request a quote for the pricing. First-time users will need to register for a SciFinder account.
Free chemical database (searchable by name, CAS, structure) with pricing and availability information from chemical suppliers. Also accessible within the Reaxys database. In Reaxys, mouse over the shopping cart next to any chemical structure to bring up a link to eMolecules. If there's no shopping cart, you'll still get information on synthesizing that compound.
A wealth of economic information on minerals, including historic data and mineral industry reports by country. Publications include: Mineral Commodity Summaries, Mineral Industry Surveys, Minerals Yearbook and Metal Industry Indicators, Nonmetallic Mineral Products Industry Indexes.
Articles on all topics in chemistry and chemical engineering, including production, uses and economic aspects for many important chemicals. Good complement to Kirk-Othmer, but note the date of the article.