Relatives and friends of members can put up fliers in all kinds of interesting places, schools, churches, hospitals, work places. I had one call from a women who saw our flier in the 50th floor women's rest room in a large downtown skyscraper. To this day, I still don't know who put it there. Consider renting a booth at local fairs and special events that happen throughout the year. Find out the details and set up your schedule well in advance.
Some events require several months notice.
Often non-profit groups can get in free or receive discounts on booth space. If there are three or four communities in the area looking for members you can do a Communities Fair and join forces. Several cohousing groups in Seattle have done this and it has been a good source of publicity. Find a medium that shows your community well. At Sharingwood they use a three by four foot display board that is filled with photographs showing various aspects of the community.