No, that's not how this website is organized. This is the correct forum, Cruise and Travel Insurance, because the OP asked for "third party" i.e. non-Carnival sponsored insurance.
It's no different, for example, when people ask on the Carnival board if there's a CVS store near the pier in Miami where they can buy wine before boarding the ship. Yes, they're going on a Carnival cruise but Carnival doesn't own or operate CVS. Those kinds of threads are usually moved to the Florida Departures board. It's one of the main reasons that all public message boards have some basic rules of use and are often moderated to better enhance navigating the website and the knowledge being shared with all members of the site.