CARFAX says there's a 2000 Ford F-350 8 Cylinder 7.3 L with Four-Wheel Drive, 20 Inch Wheels, Towing Package, and 202,126 miles in Ft. Worth for $15,500. That's the first one I found when I searched for 2000 FORD F350 4X4 LARIAT 7.3L. Listed right above it is a 2001 Ford F-350 XL with 196,612 miles in Tuscon for $7,995, but it's a 10 Cylinder 6.8L. There's another 2000 Ford F-350 XLT 8 Cylinder 7.3 L with Four-Wheel Drive and 204,533 mi for $11,991 in Minnesota. A dually for a bit more in NH and a flatbed dually with 141,528 mi for for $10,999 in Il. Edmunds lists a bunch of them for sale too. Some of them are $7,000 less than KBB book price, so there's no reason to pay a lot more than they're worth.