The dealers already pay at some level to have their inventory listed on one of GM's official sites. If an individual has made it to here they certainly then have the ability to use GM's product locater function. You can fan out from where you live by serching outlying zip codes. You will find vehicles and dealer contact info. And then you are on your own to contact them.
Rules here (and being asked to stick to them) mirror the situation at not only solsticeforum.com but also corvetteforum from which these sites were birthed.
As free as society today might seem, this site and its related sites are not publicly funded but are privately owned. Their use as a public (by membership) forum remains at the discretion of the owner. A vast amount of thought and re-writing has gone into the development of the set of rules we live by on these sites.