LEGO or DUPLO ringing doorbell Does anyone know if this piece can be found anywhere or what it is called? 
My kids had a ringing doorbell appox 28 to 30 years ago, where you push down a red button that sits on top of a curved yellow DUPLO or LEGO piece. (similar in shape to an eyeball piece)
I think you mean this part: Duplo Brick 1 x 2 x 2 Rounded Top with Bell



It comes with 3 different prints.

There are several sellers on bricklink selling the part.