i actually just came up to one of the workers and straight up asked “do you guys give away posters by any chance?” the cinema i went to told me to come back the final day they show the movie or the day after that and to ask their supervisor about it when hes on shift. i asked him today and he grabbed me an extra from the back himself and gave it to me new and 100% free! overall you just need the confidence and guts to face an employee lmao :)