This is the first post I made. I'm revisiting the idea of making an audio amp with an OpAmp. I will use a LM358. It is a dual section amp which doesn't need a dual power supply and will work with a 3 volt supply.
This is the circuit except for the LM308 's in it. I don't have a model for the LM358. The split supply is not needed with the LM358 so The battery goes from top to bottom of the circuit. I made one on a breadboard and it drove a small speaker.
It's not an LM386 but Digikey has them for 30 or 40 cents each. I think I saw them for $15 a hundred. They are dual amps so I used both section set to a gain of 100. It would be a simple matter of changing a feedback resistor to change the gain.