Contact the career center at your local college or university and inquire about listing your job openings there. This is a student resource at no cost to you. If your opening is a Monday through Friday job during the day, don't let this deter you because some students attend school in the evening. You may need to adjust work hours to accommodate someone's school schedule. Many students are available only for part-time work in order to keep up with their studies.
Hiring an intern is another option at the college level. An intern works for you at no charge in exchange for college units. Since it's a vocational educational opportunity, the school will have to approve of the job duties before an internship agreement can be made. The duration of the internship usually runs in conjunction with the semester, and part-time work hours apply. Prior to hiring an intern, it's best to interview them just as you would any other employee, and you may ask their professors for a letter of reference.
High schools and adult continuing-education facilities often offer vocational programs similar to internships at no cost to you. The purpose of these programs is to teach job skills in preparation of venturing out into the workforce. Like internships, these programs usually provide only part-time workers.
Before entering into an internship program, ask yourself about your needs. It takes time to train a new employee, whether or not they are paid, and time is money. Can the duties of the job be learned quickly enough to justify the short time that someone will be working?
Just because someone is an unpaid intern does not mean that poor work performance is acceptable or should be tolerated. They are being graded to work for you. Look at this as their compensation, and expect as much out of them as you would a paid employee. Also, be prepared to show proof of workers' compensation insurance to the high school or university you are corresponding with. Whether a work-related injury will be the responsibility of your company or the school is another issue.