A quick Google search lists one place that will give you a quote, but it depends on distance and the weight of the batteries. Under 42k pounds is less than a truckload and over a certain distance they aren't interested. Scrap lead isn't the same thing as scrap flooded lead acid batteries.
At work we had a dead lift with a 400AH 24v battery and Deka offered us $60 for it. We got that battery fixed and the lift restored, fortunately. 4 brand new 6v flooded batteries that would have replaced the flooded battery in that lift cost about $650.
Based on that, I would say you are being asked to pay too much for used.