Where can you find the painting by Ellen Shaw titled Moonlight Sea that is approximately 2' by 3' and has a brass plate that says 'Ellen Shaw Moonlight Sea' and what is the price?

The painting you indicate is a lithograph copy of the artist's original. This can be purchased from several art dealer's websites, including IllusionBlings store. The artist's name is Peter Ellenshaw. An interesting fact about Ellenshaw is that he was an Academy Award-winning special effects artist who worked for Disney.