I did the same thing GTT. I was debating on ordering a '19 but I got a offer I just couldn't refuse. I got under invoice on a '18, but not as aggressively under as your deal. My truck was a tick under $70 sticker and got it for $64,240. About $700 under invoice. I couldn't justify the extra $7k on a '19 with the base price increase and MSRP. The dealers here in Tidewater are notorious for "market adjustments". I can't wait to get this thing down to the outer banks, since tourist season is finally over, and have some fun in the sand.
The window for these deals I think may be closing as the '19 will begin to show up soon and the '18 will become a "cheaper" alternative, even at MSRP, to the '19. All it takes is a little patience, persistence, and research to get a dealer to two to work with you.