If you can't find course materials through UO, you may still be able to borrow them through the public library. You're less likely to find textbooks at the public library but more likely to be able to access books for English and Humanities classes. UO students can get a Eugene public library card and/or access your home library using the Libby app.
If you can't find the textbook or material you're looking for through UO Libraries or the public library, there are many free digital repositories you can check next. These digital repositories have different strengths and most will be more helpful for humanities and social science books. All include robust filter tools that can help narrow your search.
When you are affiliated with a higher education institution, you have information privilege. That is, you have access to Library-subscribed scholarly content that is not freely available on the open web. This access usually ends when you graduate.
Led by academic libraries and information activists, the Open Access (OA) movement provides an alternative: a bridge to to open scholarship, no matter your institutional ties. OA expands the content that is available across access barriers, and is gaining ground in the scholarly community.
OA resources will be available to you after you leave University of Oregon. For more information on open access at UO see the Digital Scholarship Center website.