Finding relevant OER is similar to doing literature research. The availability of OER varies depending on the subject matter and course level. There are more OER for lower-level or foundational type of courses. Here are some search tips that may be helpful:
Reach out to your Liaison Librarian for more guidance on finding OER!
There may not be OER suitable for your course or the OER you found are not sufficient to cover the curriculum. To still provide cost-free and customized course materials, you could:
Sheridan Library's eCOR service can help if you want to mix and match OER with copyrighted resources!