Oh, I ASSURE you the price difference is that great ....... unless some here lie about the HIGH price they are paying. I personally checked many dealers before buying my '18 P1K5D in Oct '18 for $14.6K OTD. I was given prices $2K higher and have seen post from other parts of the country that would easily be $4K higher.Dealers that advertise below invoice all the time typically make their money on things like Extended Warranty, "Tire Warranty", GAP, various fees, finance charges, charges to not finance, ect.
Also, for the most part (I can't speak for everywhere), there's not really anyone selling for $2-4K less. Just pay attention to your Out the Door price no matter where you go.