I know Cedar Point sold one a few years back in the gift shops. At the time I didn't think the pics were all that special so I didn't get one, but I wish I had! I think it would be a nice souvenir of different parks, and I, too, have wondered why we can't find such calendars when you can find them for so many different hobbies and interests!
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Po!nt of View: A different look at Roller Coasters.
http://www.crosswinds.net/~justmayntz/thrills/index.html