There are several low and no cost options for finding Supreme Court opinions. These sites vary in coverage and search capabilities. Remember that it is important to update case law to ensure it is still good law, some sites may not be comprehensive. For guidance in general case law research, please visit the Case Law Research Guide.
There are not as many low and no cost options for U.S. District Court and Court of Appeals cases, but below are links to some of the sites that provide access to these materials.