I know this isn't really a discussion topic, but since this group is primarily interested in posters, I thought you'd like to know that The International Poster Center, the largest poster dealer and auction house in the US, now has an ebay store. http://stores.shop.ebay.com/Posters-Please.
There are literally hundreds of original, first printings of posters, ranging from the late 1800s all the way up to the 1980s. We're here to answer questions, and the prices are very reasonable (best offers are always welcome!).