Where can I find a high quality image archive of movie posters?

Where can I find a high quality (to scale) image archive of movie posters? I can find decent quality images using yahoo or google image search, but I can’t seem to find an archive that deals specifically with movie posters.

It would seem to me that there must be some form of the original images in file if not a high quality oversize scan of the posters in some database. Any clue? Thank You

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