Don't know if anyone else has looked at these .
I used one on a hasbro conversion that the sound chip had blown in. recorded an MP3 of a blaster sound on to it using the onboard mic and then soldered a red supperbright led in with the speaker so during playback led fired up aswell.
This can also be used as a voice amp so may even have more uses.
they sell on eBay for about £5