Why not place the same ad in 2 local papers. And on and on. Keep it simple. Classifieds, when worded right can also be an excellent way to advertise. 4021, another 3021.
Advertising has by far the largest potential because growth is truly unlimited.
However, it is, in my opinion, also the most challenging and potentially costly avenue. In September of 1988 I finished the software program for the Personality Profile. I went out and bought advertising space in 9 nationwide magazines - full color, full page. It took me years to get over that disaster. I have no doubt in my mind that, had I started slowly and used the money I lost in this venture following the above mentioned scenario, I would have succeeded much quicker.