If you only need a couple, buy the ones from the link - they look absolutely ideal for what you require.Hi guys, thanks for the input. I forget to state I only need a couple of these circuits as I'm making them for a few friends. After googling, I found something that might do:
Plain recordable greeting card - RNIB Online Shop
I can't afford to buy 1000's of these really. I'd really like to make one.