You can perform searches by structure, by a portion of the structure (called a substructure), or by a reaction scheme in many of Penn's chemical science resources. Here are a few of the most comprehensive.
Commercial availability can be tricky. It is generally most efficient to search an aggregate source that contains availability through multiple suppliers. Depending on the supplier, however, the aggregators may not include information like quantity or price. In a case like that, you will have to go to the individual suppliers' Web sites for the missing information.
Handbooks can be a quick method of finding physical properties, especially if you wish to find the same property for a number of different substances. Bear in mind that each handbook has two scopes: a scope of substances and a scope of properties, and that the two need to intersect for you to find the information you need. Not all properties covered are available for all substances!
Handbooks are listed in alphabetical order.
These research guides can help you navigate these and other substance, property, and reaction resources.