Holli,
Not knowing specifically the kinds of positions for which you are recruiting, it is difficult to recommend a particular source. However, referrals are usually a good source. At least the individual has been identified as a good potential candidate. Someone has seen their work habits and thinks they might be a good fit with your organization.
Professional associations are another possible source. Usually those organizations are career specific and that might cut down on applicants who are not qualified for the position. Of course, this whole process needs to begin with a detailed job description against which you screen all of your candidates. Minimizing the number of qualifications which are "preferred" vs. those which are "required," should result in better qualified candidates. You will always have those who apply for everything regardless if they meet the qualifications or not.
Dr. Patricia Kapper