Sound/Voice like on talking doll?

[RobertBG]

I did a setup loosely based off of this and I was around 3$ per unit for 500 http://hackaday.com/2013/06/11/giving-toys-an-electronic-voice/  I'm sure that could be trimmed down and some of what we did could be left out in your case.

If that doesnt work for you I'd go with a existing product 

[Psi]

Cheapest solution is going to be the greeting card ICs, however i think those are maskrom so have to be manufacture with the sound (ie they are not programmed).

Easiest solution that's still cheap is using the cheapest micro you can find with the audio samples stored in flash along with the code.
Not sure if a PWM DAC will be fast enough, should be.
But a cheap audio amp made from discrete components is cheap as well

[nardev]

Thank you all guys. you were so helpful.

I'm never disappointed with this forum.

[nardev]

If anyone needs this again, here is all you need for "demo".

http://playground.arduino.cc/Code/PCMAudio


If you need 10k+ of devices, you can order custom audio chip from alibaba at a rate of .40-.70 per device. They can even make you custom enclosure.