When I grabbed my GMC 300 2ton dually,The guy asked for $300 and I didn't haggle,also bought a 1952 Chevy 3/4 ton from the same guy that day for $500,which my buddy just had to have when I brought it home the 1.5 miles to my house.The deals are still out there.
Usually though the purchase price doesn't reflect all the time and money in parts that is poured into these trucks once they live in your yard/field.
Tim