I stopped by another Ford dealer today on the other side of town. They had a new F350 DRW Lariat but I assume that was somebody else's as it had no window sticker or anything. You could tell it was new but it was not in the area with the other Super Duties.
A salesman was riding around in his little golf cart so I asked him about their situation on F450s. He said they get very few and it's just luck on getting one. He said they were taking orders right now for 2023s and they estimate 8 months and they were pretty consistent on MSRP. No mark-up but no haggling either.
I think I may go back to the dealer from yesterday and seriously discuss ordering me either an XL STX or a Lariat.