Tool box door & hinge off a rust free box (of course that would leave the bed worthless): $600... or you can get the it with the complele bed for the same price.
Used bumpers are not worth boxing & shipping. You can buy a new one a lot better for the same price.
"Why can't the first truck be sold as is?" Well, I guess it could, but then I would be a truck dealer, instead of a truck parts dealer...but let's say $3,500 and you can drive it home. I wouldn't pay that much for it, but if you just don't want me to part it...OK.
Forgot the grill question: complete assemblies (won't take 'em apart), inner & outer=$250 & $350 + boxing & shipping costs.