Tony, count it done!
A suggestion that is free to you is to take pictures of your flags, that you have supply of, and make a collage photo that you could have reprinted. Businesses sometimes have bulletin boards where people can advertise things for sale or services that they are offering that are free to use. Pin your collage to these boards.
I happen to live on a road where more than 70,000 cars passed by every day. 
Blessings