Think Tanks are independent organizations that often focus on policy research and analysis. Below is a list of several high-profile think tanks in the United States. Many of these organizations publish reports on their websites.
You can use Google to easily search government websites by including site:.gov at the end of your search string.
Because most government reports are published as PDF files, you can also limit your search to a specific file type by adding filetype:pdf at the end of your search string.
Sample search: healthcare policy site:.gov filetype:pdf