At the request of our users we have added more price index charts for more consoles. We've added charts for Sega CD, Sega Master System, Sega Saturn, Atari 5200, and Atari 7800.
The price for the average licensed game for Sega CD has almost doubled during the last two years, going from $8.29 in January 2010 to $15.28 in August 2012. Even though the price increase doesn't look as dramatic on the Sega CD chart, it is a bigger increase than prices for Nintendo NES.
Read more about how the PriceCharting Indexes are calculated.