1997 Ford Explorer bearings pieces in transmission pan

My transmission started delaying in shifting reverse and drive until it warmed up. My o/d light was flashing. any way I took it to a transmission shop. They show me the pan it had piece of bearlings and little pins. I do know the difference from a little metal but these were part piece. I was told that my transimission needed to be rebuild. How much do you thing it should cost to rebuild? I also need the MLPS and the O/D sensor which I already knew about because of the codes.
Thanks Eve