How to acquire these posters: It takes some work to find these (and find them at a resonable price.) 27x41 reproductions of the US teaser and UK official are available for $12.95 US dollars at the Newline online store. For the others try searching for "movie posters" or "movie collectibles" on Yahoo. You can also look at ebay for auctions but there are never any posters there that can't be found elsewhere for less. Prices rise as some get carried away with online auctions.
Also note that while I do own some of these posters, most of the images are from around the Internet and I personally am not selling any of them. Any additional help on sizes, images, or any other info would be greatly appriciated. Send it here.