Well I haven't seen a lot of protos, so its hard to say. When I lived in Vegas there was a good vintage game store called Game World, and they had a few there. I remember one of them being 150.00, but it was on Super NES. I think it was the most expensive one they had. They had a NFL quarterback club for SNES as well and it was 75.00. I never thought twice about them at the time because I wasn't a focused collector, and that was a lot of money for a single cart. Figure out what he might want for them and send me a text to 702.235.2933 and we can discuss privately.