Buy Me This:

Along with a vocal controller:
(Click on the pic to check it out)

"Mechanical Mouth kit - M ( Open / Close Motion)Newly Enhanced(Ball Joint, Servo Bracket, Setup)
With this complete kit you can build a mechanical mouth module that will open and closed using the attached micro R/C servo.By connecting the R/C servo to any of the optional control board you can create a fully programmable mouth module with automated control and playback or to the AutoTalk controller if you want to convert sound directly to servo motion control."