I am also in a small town, and found the paper insert to be an effective, cheap way to go.
I chose the paper that had the local grocery store ad in it, many people will not read that paper, but most households will pull the grocery store ad out, and your insert will come with it.
The one here, anyways, has different zones. We did one zone every week for 5 weeks.
The one problem we had was that people didn’t get the inserts (this was for something different & the other paper) Breaking up the zones I was able to contact friends in that zone to make sure that the paper was doing their job.