AllPosters: Wide selection starting around $54.99 for 25" x 37" sizes.
Film/Art Gallery: Specializes in authenticated vintage posters, with prices ranging from $175 to over $6,000 for rare items like The Good, the Bad and the Ugly . buy framed movie posters
Art of the Movies : A collector-led shop focusing on original theatrical and vintage film posters. : AllPosters: Wide selection starting around $54