Seems he jumped the gap from Atari to Last gen practically.... From what I recall, games were straight $50 for the longest span of the existence of vidyah.
Don't know what it was like during the pre-crash/crash days but NES games were usually $45 to $50... Master System and Genesis RPGs (Phantasy Star especially) were a bit more money due to ROM sizes. I remember PSIV being sold for $110 back in the day! SNES games tended to be a bit higher on average than Genesis games (I believe due to the fact a lot of SNES games had add on DSPs and other chips), $60 to $70, with more for RPGs (FF6 I remember buying for $80). Some of the smaller ROM size NES/SNES games were cheaper, Mystic Quest I remember retailing for $40.
The PS1 era was the one that really standardized the $50 video game, with some exceptions (the $20 Greatest Hits lineup, some other budget titles like Spec Ops on the low end, with the WD collectors editions on the high end).
I remember Atari 2600 games costing $40-50, but 30s of googling says they were $20-30 (in '70s dollars), which is a significantly higher worth than $50 in 2021. Also just learned that Activision originally just started selling their reverse-engineered cartridges without permission from Atari, which lead to lawsuits, settlement, and then licensing — making Activision the first 3rd party videogame developer for consoles.
I also remember seeing "Custer's Revenge" cartridges behind the counter at the local music store (vinyl LPs and cassettes), and it was $70 or so, but it was a weird artifact: an X-Rated video game, where the goal is to rape bound Native American women. …Yeah.