I've always been a fan of the attraction posters that you see when you first enter the Magic Kingdom under the train station. I wanted to know if there was any place to buy a replica of one of these, either online or in the park. I'm especially interested in the Haunted Mansion one.
Sorry I missed this thread earlier!
In some of the art stores at WDW - the store outside the animation building at MGM, I think the castle gallery inside Cinderella castle, probably The Art of Disney too... They had a print-on-demand system that had a lot of the posters available. They were printed on art paper and if I remember right ran about $40-$45.
Try emailing firstname.lastname@example.org with your request. They might be able to tell you what is available.
you can often find them on ebay as well, assuming that's your cup of tea.