I have two Bachmann spectrum 44 Tonner locomotives. These are the ones with the two motors. I found the difficulty of putting a decoder in will be quite difficult so I am replacing them with NW2’s. Now I am thinking of selling these and not sure what a good value would be on them. I have someone trying to lowball me at $20 for both. What would be a good market value to place on these since they are no longer available by Bachmann? I want to be fair but I don’t want to be ripped off either. I have a hard time placing value on such items. Thanks!