I have a collection of Rivarossi Big Boys and Challengers. They are good runners for their time, but the Athearn's blow them away in quality and detailing. I would be surprised if you would get $100 for a NIB unit. I plan to keep mine, convert to DCC and run doubleheaded with my Athearn's. I'll put an Athearn in the lead and a Rivarossi running 2nd.