Amazon Prime's collection of older, particularly genre and cult, films is truly astounding. If you have an Fire Stick you can also browse by Director/Actor/etc and find a treasure of fantastic older films.
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A huge swath of pre-millennial cinema (i.e. 90% of cinema's timeline) is easily available, streaming or in the form of super-cheap (or free) DVDs. Amazon Prime's selection is mind-boggling. The problem is, people increasingly think only Netflix exists. It's bizarre.