Here is a small selection of catalog sites for laboratory-grade specialty chemicals. For industrial products and bulk commodity price information, see the pathfinder on Chemical Engineering Economics. Don't use research chemical catalogs for plant estimation projects.
Use the "Explore Substances" tab to locate the Registry record for a compound, and click on "Commercial Sources" to link to CHEMCATS, a database of chemical suppliers that provides laboratory-quantity prices and sources for that chemical. Supplier data can be exported to a spreadsheet.
Searchable product catalog from a major research chemical supplier. Search by catalog number, name, formula, CAS registry number. Chemical/physical information, structure image, FT-IR and NMR spectra, and MSDS are displayable. Registration is required to view some information.