You can use Google Advanced search and limit your results by usage rights. Choose "free to use, share, modify."
These metasearches allow you to search many repositories at once.
Barnes and Noble has an OER solution called LoudCloud. It contains fully formed course shells that utilize OER and integrated with Blackboard. These courses are customizable.
For more information contact Wayne Parkins- w.parkins@bnedloudcloud.com