There are approximately 106,000 doctoral-level licensed psychologists in the United States.
Start by searching PsycINFO to find the names of tests that have been used in research and written about in the literature. Test names appear in both the Abstract field and the Tests & Measures field. If the document includes the actual test in its entirety, it is marked "Appended" in the Tests & Measures field.
APA's Science Directorate is a good source for general information about psychological tests and test publishers. Visit their Testing and Assessment page, which includes a link to frequently asked questions about tests.
Another good source for test information is the Buros Institute Test Reviews Online.
The APA Science Directorate answers hundreds of calls and e-mails each year from persons trying to locate the right test or find more information about psychological tests. APA neither sells nor endorses testing instruments, but it does provide guidance in using available resources to find psychological tests.