There are a number of well-regarded OER repositories as any Google search will reveal. But have a look at the Pressbooks Directory! The Directory is a searchable online catalog listing all publicly available Pressbooks books. Everyone has access to these materials, regardless of whether you already use Pressbooks or whether your institution has a Pressbooks network. And if you do use Pressbooks, it’s simple to clone, copy, adapt, or remix content from existing Pressbooks OER materials into your own new book.