How much money does the last supper painting cost?

The painting by da Vinci is actually a fresco and is on a monastery wall in Milan, Italy. The Italian government has no plans to put it up for sale. Many factors determine the value of a work of art. Auction prices can be a gauge, but the art market is always changing. Consequently, it is not possible to assess the value of a work of art until it is up for sale or auction.