I am in the Bay Area and purchased a 2000 Excursion 7.3L with less than 60K miles where the prior owner did the heavy lifting of modifying it with bumpers, lift, exhaust, etc, and I paid less then $20K. Granted, I looked for a very long time and I was in no rush b/c I already had an excursion but they are possible to find if you are patient. If you can find an Ex with a John Woods transmission, get it! John Woods makes killer transmissions for the 7.3L diesel and the tranny is the weak link.
I have currently gutted the interior so I can Dynamat the entire vehicle. While I am there, I am installing an ARB air compressor, 2 gallon tank (which fits perfectly above the rear wheel well, and some other mods for overlanding.
Long story short, I love the 7.3 and the Excursion.
Scotty