Best Sourcing Services for Educational Staffing?

I’ve received the green light to explore additional sourcing methods, provided I can demonstrate the value of the investment.

At the moment, I’m primarily using Indeed Smart Sourcing and LinkedIn Recruiter. However, with Indeed’s outreach limited to just 30 contacts, it’s a bit restrictive. LinkedIn Recruiter offers more InMails, but unfortunately, I’ve had very little success with it compared to Indeed and our ATS. My top request right now is for Indeed Premium to gain access to 70 more contacts and additional useful features, but it’s significantly more expensive—over double the cost.

I’m looking for recommendations on tools that provide a good return on investment for sourcing educational staff. Any suggestions for creative sourcing strategies or reputable paid services? Is ZipRecruiter worth the investment? Has anyone had experiences with Teacher-Teacher or Smartspring? I’m also interested in ethical AI-powered services for corporate use. Thank you!