The Alternative movie poster website is the main place to go for fans of movie posters and how the can be recreated by other designers. It uses the title which sums up exactly what they do as a company and makes it evident of what they are cataloguing.
Their website, again like Poster Spy's gives visuals of each of the posters, but I feel this website uses a better layout, and executes a method of showing around 1/3rd of the poster in a thumbnail, which is enough to show which film a poster has been created for, but not enough to give the whole poster away, so entices the audience to click on each poster they are interested in.
Again, like poster spy, this company has an active facebook page, also seems to not have a massive amount of likes, but I suppose the best place for seeing all of the company's posters is on their website.
Their facebook page is regularly updated, similar to Poster spy, and the fans whom have 'liked' the facebook page will be supplied with a consistent stream of fresh new movie posters.
This image shows all the photograph tab on their facebook page and the amount of movie poster which they company has to it's name and in it's archive.