Where are u, how much are u willing to spend, how far will u travel, how much work are u willing to do? All this will affect your search and either broaden or narrow the possibilities.
Ive got a 67 D100 slant 6 parts truck in CA, needs a lot of assembly to put it together, but the cost would be high due to the value of the many rust free parts, particularly the cab.
Plastic trucks suck...
Iron trucks rule...