I did it through a dealer, but it took ALOT of work, and being in the right place at the right time.
After 1 month of searching got one Tuesday. 2006 F350 6.0 Lariat Dually Crew 4x4 with every option available (even a sunroof and factory trailer brake) still under warranty $24k and it has 6 brand new tires.
I looked at 20 different trucks, and the very first truck that I looked at was an identicle 2004 with higher mileage at $18k, I went to buy it and somebody else was there filling out the paperwork.
I had a buddy at the auctions, and got a few pics of what I was looking for, but they were all a little ruff.