Many primary sources have been digitized and made available on the web. You have to be careful, though, because often the source of the document is not provided. You need to evaluate each web site carefully to determine if it is reliable. In general, you can just add the words "primary sources" to your search to locate such documents on the web. The following sites are examples of what you can find on the web.
If you are researching a contemporary topic such as human trafficking or free speech or mass incarceration, you will be able to find reports and documents from various organizations and think thanks that can be considered primary sources. For example, several international organizations, like the United Nations or Human Rights Watch, publish reports on human trafficking. You can find them easily through a Google search. Below are some examples: