I have a friend who is the sales manager at one of the Infinity automobile dealers. I asked his help. I am an amateur...he is a friggin' trained assassin. I was actually pretty happy with the prices quoted at the boat show, however he used that as the starting point and shaved another nearly $15k off the deal. Watching him negotiate, I was awestruck. Every time we had a deal and papers hit the table, he went back for more.
Is your buddy for hire - I'd bet people in the market for a new boat wold gladly pay out 6% or so of the money his services saved them...