The price is whatever your comfortable with paying....it's almost impsossible to grade a truck from pics, it needs to be driven and you need to know what to look for like any purchase of a vehicle.
pics don't show worn ball joints, pitman, idler, hard starting, burnt glow plugs....I look for unmolested components.
Price is all relative....people want to use Gp auctions as a guide, which is somewhat fine, but I know guys that bought 20,30 or more trucks and once they get them...they can be beat to crap, more often then not....at least NTC and yermo trucks....driven hard and hung up wet for many years. They look good from 10ft.
set a price based on your finances, search from there, go get in the trucks and drive them....local is always better so you can do your inspection and drive it, plus you have no real transportation costs.