What is the best solution for creating an online scoreboard site for car dealers?

Question

CMS

Hello. There is experience and certain contacts in the field of official car sales. There was an idea to make a resource, like an online arrivals and departures board, organized in such a way that cars that are clearly in stock are displayed in real time. On what it solution to build such a model of interaction with dealers and our system in order to receive and display information? Moreover, the solution should not be expensive and already at the beginning had the potential for customization and scaling. I understand that the question may be somewhere for children in the context of Habr, but I really respect Habr and all its inhabitants), so I would like to hear your opinions. Thank you.