If you want to convert an Raspberry Pi into an arcade, Adafruit has a board called the Arcade Bonnet for $15. Of course you have to buy your own joysticks, buttons, speakers…etc etc etc. Oh and of course there is shipping and sales tax….
https://learn.adafruit.com/adafruit-arcade-bonnet-for-raspberry-pi?view=all
buy it here https://www.adafruit.com/products/3422