As OER grow in popularity, aided by programs like the California Community Colleges Chancellor's Office's (CCCO) ZTC Degree Program, more become available all the time. If you haven't looked in a while, it's definitely worth looking again! Here are the best places to start:
The ASCCC-OERI's OERs by Discipline lists, curated by Discipline Leads
OpenStax, peer-review full textbook equivalents in Business, History, Calculus, Physics, and more
LibreTexts, the CCCO's preferred platform for funded projects
For more information on the search process and locations to try, check out this Introduction to OER Search slide deck.