We are not talking about your standard prints, rather the huge movie posters you see placed on the sides of buildings, across the ceilings of theatre lobbies and on the walls of shopping malls.
According to Philippe Hancock These types of movie promotional posters are not only difficult to find but are generally never for sale to the general public. You can view his profile here : Philippe Hancock profile
The very first thing you will notice about these posters are their enormous size. They can range anywhere from a bus stop shelter size of 4×6 feet all the way to an enormous building wall size of 5×10 feet. There are many other variations of the sizes but in short, they are huge! This is one of the main appeals of these types of prints especially to the collectors.
They are not considered to be small reproductions of the originals since they are designed primarily for promotional or advertisement purposes only. The quality of the materials is definitely high since the majority are made of vinyl and not regular paper. Basically, they are produced to withstand extreme outdoor weather ranging from cold and wet to hot and dry. The ink is also a special concoction designed to prevent fading due to long periods of exposure to direct sunlight. You will find that the colors of these prints are more vivid and much brighter than other posters.
For many fans, taking home a piece of their favourite movie in the form of a large movie poster is something that is highly sought after. However, trying to obtain one directly from the establishment that is displaying the poster is another story. They are required, under contract by the movie studios, to return the items back to the studios after the promotional period has come to completion. Under no circumstances are they to sell the posters for profit. This makes them much rarer and seemingly unobtainable. The good news is that there are many sources that you can go to, to purchase your desired poster.
Local print or online classified listings will reveal certain individuals who happened to take possession of a few of these large movie posters somehow during their employment in these establishments. Even though you may be lucky enough to find some they are quite rare and usually hard to find. Certain online or bricks-and-mortar retailers may also have connections which allow them to obtain some original prints of huge movie posters but the majority only acquire licenses to re-print similar sized versions but they are still copies of the originals. The best place is actually online auction websites as the majority of sellers of legitimate and authentic movie promotional posters are private sellers who somehow found a way to obtain a steady stream of original prints and make them available for buyers to purchase.