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Anonymous File :-(, x)
If you're looking for physical posters, this place sells some. They seem to be a non-profit association affiliated with the national park. Only checked a few and they were varying around 1'-4' in each direction, but they might have something larger. You could also contact them and ask if they know someone that does extra large photos.
http://www.grandcanyonassociation.org/grand_canyon_bookstore_featured.html
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