Our church had a full set of school bus seats that were track mounted. Some were still encased in the plastic sheathing from the factory and never been mounted in the bus.
I had a hard time even giving some away.
Since they are track mounted and will stand alone without tipping we have lined them up along the wall in the gym. With the wall behind them there is no way for them to tip over. They have become very popular seating for parents when youth activities are happening in the gym.
As far as price is concerned, you might get $100.00 for the whole set of seats.
We keep a few used seats in our scrap pile for the customer who needs a seat or seat frame to replace one that has been broken. But for the most part we strip them of the covers and foams and scrap the metal and toss the rest.