You can make an advertisements at schools, colleges etc.
Do know I did this once in my desperate for work days, and spent a lot of time designing a small poster with tear off strips on the bottom with my name and phone number on.
And so off I trotted around students town putting these up and I must have spent four hours walking around there putting them up.
Rather proudly I sat down in the park surveying my work and thinking about all the money I would make out of this.
Suddenly I saw a rather large guy walking around tearing down all my work, I ran over to him and asked what the hell does he think he is doing, and he answered me in a thick Irish accent, 'feck off, this is my patch'.
Teachers can be such bitches sometimes lol