Here's a sure enough early 2017 (11-7-2016) located at The Dalles, OR. Of course, they're not showing any discount, but for a Supercab, 6.2L, it sure is loaded up. Ford seems to hold their cards close on last year discounts. 10-12K on leftover Rams seems to be doable, I'd guess Ford ought to be close.
2017 F-250 Supercab 6.2L LariatHave you checked out an XL with STX package etc.? Sure makes a nice tow rig for the money.
Edit: poking around a little, dealer in Weiser, ID advertising $ 10K off a 2017 long bed XLT supercab, 6.2L ~ $36K