as with any transaction, the rpice can be negotiated be desire , availability chicken entrails and tea leaves. Prices vary across the world so far as I know you don't know if there is a shuttle and bobbin underneath the slides. If someone wants to use it, that is a vital question. If one uses ir for décor it is no big deal They don't show. When I was first on board I many ave paid $75 for yours. Now that I have too many I am getting some treadles for free.
If you sell it in KC there may be a rare collector who is after that local badge.
Check out your local on line markets and you can get an idea for asking prices. and realize you can post high and lower prices if you don't get results as soon as you want.