This is cheap, easy to take a part, pretty straight forward to reuse.
SAW 3 DIGITAL VOICE RECORDER | AllElectronics.com
For $2.00 (plus shipping), it's a good deal. You get 30 seconds of recording, 3 AAA batteries, small case with built in battery holder, microphone, and mini speaker (not piezo). The ugly little troll is held on by two screws. White paint and made in China, probably not a good toy for the dog, or small children. Loud enough holding it in your hand, but not so much across the room. Needs amplified and larger speaker.