ProQuest Supreme Court Insight includes full opinions from U.S. Supreme Court argued cases, including decisions, dockets, oral arguments, joint appendices, and amicus briefs from 1975-2017. (The database is still being built, so all dates are not yet covered.)
The search interface provides quick access to case histories, briefs, and landmark cases. An advanced search option provides many more options, allowing you to limit to content types, date ranges or court terms, court of origin, Justice/Opinion type, and Amicus Curiae Briefs. You can search within the documents for names and organizations, attorney names, Justice names, petitioner names, respondent names, subject, and Supreme Court Case name. A detailed guide provides searching advice.