If I remember right Sega Genesis games were $49.99 new. It was release in North America in 1989 and discontinued in 1997. Using the BLS CPI inflation calculator (
link) that means adjusted for inflation a Genesis game in 1989 would have cost $91.78 and in 1997 the adjusted would be $70.91.
Heck even the $59.99 price we see now were the going rate on XBOX, playstation 2 ect, so if you bought HALO in 2001 at $59.99 the inflation adjusted cost today $77.12.
The end result it whether you realized it or not you have paid that prices for games before, looking at what money could buy then and now.