SMS and NES games from $30:

http://www.huguesjohnson.com/feature...4-SMS_full.jpg

http://www.huguesjohnson.com/feature...5-NES_full.jpg

1983, most games $30:
http://www.retroist.com/2008/12/17/t...ideo-games-07/

Maybe prices had come down by then at the beginning of the crash, but I do remember Indiana Jones for the 2600 being particularly expensive because it was $40.