NB: Failing these sources, to get copies of cert petitions in cases where cert was denied, patrons may need to contact the Supreme Court Clerk's Office at (202) 479-3011 and have the docket number. It is likely that the patron will need to have someone physically go there and copy the document.
Landmark Briefs and Arguments of the Supreme Court of the United States: Constitutional Law: KF 101.9 L35
Lexis Advance: Briefs, Pleadings, and Motions > Federal > U.S. Supreme Court Briefs
Office of the Solicitor General: All briefs from the OSG 1998 to date (PDF); selected older briefs 1982 to 1997 (html)
SCOTUSblog: Merit, amicus, and petition granted briefs from 2007 to date; PDF
ProQuest Supreme Court Insight: When fully populated at the end of 2017, this database will provide coverage of records and briefs from 1975. Currently, all of the cases from 2004-2015/2016 terms are online. The current schedule is to complete 1995-2004 by July 2017, 1985-1994 by October 2017 and 1975-1984 by December 2017. For the current term, the database will be adding material on an ongoing basis while a case is pending before the Court.
U.S. Supreme Court Records and Briefs (1832 to date): Microfiche holdings
U.S. Supreme Court Records and Briefs (1960 to date):
Westlaw: Briefs > U.S. Supreme Court:
The joint appendix or appendices includes the relevant docket entries; any relevant pleadings, jury instructions, findings, conclusions, or opinions; the judgment, order, or decision under review; and any other parts of the record that the parties wish to bring to the Court's attention.
Lexis: joint appendices beginning in January 1979, with selected coverage from 1936.
Westlaw (SCT-JA): Selected joint appendices from 1982 to present.