Free or Discounted Learning Resource Alternatives for Splunk Power User and Admin?

Good day everyone. I'm someone who is not new to the Splunk game per se, but new to getting the certs. I was able to get my regular core user certification recently using the free Splunk Fundamentals 1 course.

However, I'm really wanting to go the distance and get the Power User and Admin certs as soon as I can. I noticed the classes were way too expensive and I don't have a company that is a partner and that would pay for them. They said I'm essentially on my own here.

Do you guys know of any good books or courses or anything that you know definitely would help me pass my Power User and Admin exams respectively? Any help would be appreciated.