How much is Dr Gachet by Vincent Price?

Although many film actors have taken up painting, I am not aware that Vincent Price ever did. He was however an avid collector and widely respected in the art world. There are two paintings entitled 'Dr Gachet' done by Vincent Van Gogh. One is held in a private collection and the other is in the Musée d'Orsay in Paris. Also, it is not possible to assess the value of a work of art until it is up for sale.