Finding prices for bulk chemicals has always been a challenge. Prices for bulk chemicals (e.g., 1 metric ton) are significantly different from finding laboratory chemical prices (i.e., one cannot just multiply 1 kg price found in a catalog by 1,000 and obtain a realistic price for a metric ton). In many cases, you may not be able to find a bulk chemical price for the chemical you want. With that said, there are a few places to search for bulk chemical pricing.
After trying the sources below, you might also try keyword searching of business databases like Business Source Complete .Some of the chemical industry trade literature can be searched in Nexis Uni ["Find Sources" along left column -> Industry (select Chemicals and uncheck everything else) -> click "Find Sources" button. Then select and search the full-text of one or more of the 27 publications listed]. Also see the Engineering Cost Data & Indices tab above.