If you are a resident of California, you are entitled to become a member of the San Jose Public Library (register at https://catalog.sjlibrary.org/selfreg/public). Library members have access to Safari Books Online and Books24x7. At last count, there were 445 Oracle titles available through Safari Books Online.
San Francisco Public Library too offers access to Safari Books Online.
If you know of other libraries that offer access to Safari Books Online or Books24x7, please email me at firstname.lastname@example.org and I will update this page. Or leave a comment below.