We have some more Ski Lift Chairs available if anyone is interested. Feel free to email me if you are interested.
What is the provenance of the chairs? (what ski area/lift are they from, what year was the chair installed)
A lot of the perceived value of a carrier is the emotional connection- that it came from a lift the buyer had ridden.
I wasn't aware Hall made a centerpole carrier. We don't have many Halls in the West (Monarch was the primary Colorado buyer to my knowledge), and all of theirs are outside frame. Monarch's Hall lifts date from the late 1960's to the early 1980s, so I would guess that chair is pretty old.
The OP did reply back a full year after the thread was started to say that he/she still had chairs left. So, maybe there are still some left. Whether the OP comes back and sees this though... Email is probably a better bet if someone's seriously interested.