So... just picked up my 2017 SE on Tue 10/4. I went Saturday to see what my Costco Membership deal would be. Got that, 0% / 60Mo and the Ford 1K cash back. While checking inventory locally on Ford.com to make sure my deal was decent, I got a pop up asking me if I wanted $750 Private Cash offer. Sure ! Got an email with a code for the dealer to put in Vincent. After my research I found a similar deal for 521 less what I paid. I got the dealer to increase my trade value and drop "etching" which made up for most of that. Then I told them about the code. They sounded skeptical that it would work considering I had Costco deal but ... he punched it into VINCENT and viola "you just got yourself another $750 off.
Might be worth a shot browsing Ford if you are in the market for a little more off.