Just for fun I ran the Mario 3 release price through the Bureau of Labor and Statistics inflation calculator and it came back with $127 today for what 50 bucks was worth in 1990.
I'm not saying $100 for Mario Galaxy 1 and 2 is good and correct but I will say I always find people wanking on about game prices to be a bit short sighted. Gamers are the most spoiled price point consumers on the planet.
https://youtu.be/9Q9WGTCFwzY
The vid was posted 10 years ago but it's much older than that. I remember watching it on Google videos right around Burning Crusade coming out.
Anyway, gl next time you're in Goldshire.