BCcampus Open Education provides several grants each year to post-secondary faculty and staff in British Columbia for the creation of open textbooks and related OER development. The type, funding amount, and number of grants vary from year to year. See Grants and Calls for Proposals for current postings.
BCcampus Open Education
2 How do I apply for an OER grant?
Related question: Who is responsible for the B.C. Open Textbook Collection?