Control arms, if they have the sway bar tabs, $50 each. Used torsion bars, IMO worthless, but someone might pay $50 for the pair. Steering bar?? You mean the center link, tie rods, pitman arm or idler arm? Center link maybe $25-50, tie rod sleeves $10 ea. Tie rod ends, pitman and idlers wear, so used ones are worthless, IMO. Leaf spirngs, again, used is not worth much to me, but someone might be willing to give $100 for the pair.
FWIW, new torsion bars are $150-300, new leafs are $200. These are both springs and springs fatigue with use, so if they are used... new tie rod ends are like $25 ea, idlers and pitmans $50 to 150 depending on style and application.