If you look at the link, it's not the majority of locations selling SMB for $25, it's the majority of launch titles for NES games being $25, with a few slightly more expensive.
I see some reports online that the average price was $50 in 1990, and others that say $40-$50, and maybe slightly higher for select titles. I think it's fairly safe to say that Nintendo priced their launch titles low to attract people, and third party titles were likely averaging $40-$50 within a few years.
I also think it's safe to say that most people's memories about this are fairly faulty, given 30+ years. There's numerous reports online about people saying they paid $60 for all their NES games. In addition to that, there were probably some places that sold above MSRP, and some people bought from those locations.
I see some reports online that the average price was $50 in 1990, and others that say $40-$50, and maybe slightly higher for select titles. I think it's fairly safe to say that Nintendo priced their launch titles low to attract people, and third party titles were likely averaging $40-$50 within a few years.
I also think it's safe to say that most people's memories about this are fairly faulty, given 30+ years. There's numerous reports online about people saying they paid $60 for all their NES games. In addition to that, there were probably some places that sold above MSRP, and some people bought from those locations.