They would be interesting artefacts indeed. Release prints have a limited life, so they will have usually been destroyed when they are no longer able to be projected without obvious flaws. How and where one might be able to obtain one of those prints I have no idea. Of course, I am assuming that you don't want pristine prints for projecting yourself!
In the near future (a couple of years is planned), the big studios will no longer ship any movies on film - instead using encrypted hard-drives. This means that most commercial cinemas must change to digital projectors, if they have not already done so, which have a relatively short lifespan (4k will soon be ubiquitous, replacing 2k), both technically and physically, and frequently licensing conditions will often mean that a cinema will have to dispose of all optical projectors, even if they had the space to keep dual-source screening rooms (as optical projection will imply prints which are not in control of the studio). That in turn means that there will soon be even fewer release-prints in circulation, and hence available as worn-out prints.
For the classic movies this may be survivable, as they will be transferred to 4k digital, but the majority of older movies will have their venues removed except, perhaps, as being projected in DVD (low) quality. In smaller venues throughout the world, where the costs of digitalisation are too high (even with the current, temporary, offers of support from studios), expect to see fewer cinemas and even those will be using ancient release-prints and/or low quality cheap digital projection.
Not a happy scenario for cinemas, or film-lovers. Also this is not mentioning the halting of contracts for cine negative-film production coming soon, and the effect that will have on the production of release-print materials which are (or once were) the largest proportion of film production.