If you are interested in buying an original theater-used movie poster for TRON and/or TRON: Legacy, you might want to check out this auction site:
I have bought several posters from them for both the original TRON movie as well as TRON: Legacy. The posters aren't reproductions, they are actual original theater-used posters (usually called one-sheets), and most of them are in great condition to frame and hang on a wall or use in a light box.
As of this writing, they have a TRON: Legacy double-sided one-sheet teaser poster for sale. Usually, the TRON posters are fairly rare, but lately, I have seen a number of them come up for auction.
I just thought I would pass this along in case any collectors were looking to add a TRON movie poster to their collection.