Google Scholar carries the decisions (opinions) of the state courts and the Supreme Court. Check the "Case Law" box and type your case into the search box
The Oyez Project at Chicago-Kent is a multimedia archive devoted to the Supreme Court of the United States and its work. It aims to be a complete and authoritative source for all audio recorded in the Court since the installation of a recording system in October 1955.
SCOTUSblog is devoted to covering the U.S. Supreme Court comprehensively, without bias, and according to the highest journalistic and legal ethical standards. The blog is provided as a public service.