Search listings for Monet paintings for sale. Some original Monet paintings come up occasionally on the Ask Art and Art Brokerage websites. The famous auction houses Christie's and Sotheby's regularly accept bids for original Monet paintings, and list the estimated values on their websites.
Contact the dealer associated with the listing to find out the asking price. The asking price is usually higher than the appraisal price, but it will give you an idea of what you would have to pay to own a Monet, or what you could expect to receive for a similar original Monet.
Contact an appraiser to verify the painting's value. You can also use appraiser services to assess the value of your own paintings. A list of appraisers who appraise and authenticate Impressionist paintings is available through the Appraisers Association of America (AAA) website. The AAA is a good place to search for reputable appraisers, since members must complete an exam, submit references and proof of education and experience before being admitted to the organization.
Set up an appointment to meet with the appraiser, if necessary. Consider meeting with several appraisers, as individual appraisers may value the same painting higher or lower due to their personal interest in the artist or subject matter.
Pay the appraisal fee.