Love, love, love movies, and their posters are considered forms of art. Plus there is a market for movie posters. Yep they can change in price for original movie prints. I usually go to movieposter.com because it gives a sense of what the market price is. E-bay can help too. Remember the posters need to be in pristine condition. Where to get them? There are lots of movie poster sites, make sure they are originals and not reproductions. Another place is movie theaters. Some of them sell their movie posters after the movie run.  Remember movie posters can gain value over time.

movieposter

movie poster shop

all posters

e-bay