I wonder if you can’t just put up touch screen in the store and let local dealers and residents advertise on it.
Since we have touch screens you can make the ads interactive with different sections or sub categories. That is. If you want to look at apartments, the local tailor or second hand stuff. You just touch different categories.
With a common central web site for approved ads. I think this could work. That is the startup idea.
A modern billboard for the locals with central approved ads.