Great question — answering as the UphillTech team:
What you're looking for is called the Product Advertising API, specifically the ItemSearch - http://docs.aws.amazon.com/AWSECommerceService/2011-08-01/DG/ItemSearch.html This should help you get a set of product given the title of movie, the category [DVD], etc.
Full answer by PrasannaK: https://webmasters.stackexchange.com/a/42316 (CC BY-SA 3.0).
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