Used Steering Box Pricing?

Not looking for the ultimate steal, but the average going rate. What should I be looking to pay, excluding shipping, on a usable 20:1 manual box for my Dart Sport? Im trying to decide if its worth it to get one or if I should just go all out with a Firm Feel power steering unit. Money is tight at the moment, and from what I understand this isnt a rare piece. I could be wrong on that though. However, I also need to get a pump, and all the pulleys. So the power steering chuck isnt the only part I would need. However, manual steering would require some column mods too since the car was originally a power steer.

I really would like to try manual steering to keep the engine bay clutter down, and I like the KISS factor also.

So what should I pay before I end up paying too much for the chuck? What about a column shaft?