See databases listed in the Industry Research, Company Research, and Market Research tabs.
The Pima County Public Library (PCPL) has a wealth of business-related information on its website. Some resources (like the useful Business Plans Handbooks) require a PCPL card for online access. Other resources, like business directories and business statistics and demographics, are free for anyone to access. To get a library card, visit any PCPL branch (the Joel Valdez Main Library and Himmel Library are closest to the UA campus).