Talking Through Mr. Jones Bones is similar to Talking Through Boris.It is a stone-looking skull mounted on a tombstone. It comes with a microphone with 15 feet of cord. The jaw moves and eyes flash as your amplified, distorted voice comes out of the skull. i think that the mechanism could be hacked and adapted towards your own home made prop.
Do a search on Ebay for "Mr. Jones Bones" . Beginning bid is $18.99.
Thanks for looking!