Boy, you guys think a little highly of the Excursion. I feel for anyone that pays near sticker for one, even now. No, they don't hold value real well, and yes, I have one.

Dealers may try to get better money for them now, if they have a diesel, but it'll be tough.
Dealers that wanted diesel's late in the game had to take X number of gassers also. My dealer didn't have an Excursion in stock for the last 12-18 months of their life and they sell a lot of SD's.
If you found a new '05 (they never changed the YM to '06 for the Ex. so no, they have not been on the lot for 2 years! LOL

) you should be able to get it for invoice or below. Different regions may be more difficult, but I don't think its that much different anywhere.
There's my quarterly contribution to F150!