This question asks where to buy a fairly obscure movie. Are these questions on-topic? Finding an old/obscure film can be very frustrating sometimes, so I can see a clear appeal to being able to ask such questions. But that alone does not make the question on-topic for our new site.
I think an answer to this question has no lasting value. It doesn't matter if the movie is a blockbuster or some fairly unknown movie. If a answer gives a shop, this will be too localized as the shop can be unavailable from different countries and be closed in two years. So I think that shouldn't be allowed (closed as too localized).
I see no reason this site should be unique in it's stance on purchasing recommendations - to my knowledge, no other site allows it, and I don't see an argument for it here.
I recommend the policy of "close it and refer them to chat," considering we don't want to leave them stranded (and many users here will likely have a good recommendation for them).
Like others have said it is too localized. But perhaps there could be a wiki page for known websites that stock rare movies?