Prime Video is available in 200 countries via a dedicated website. There is no way to explore the catalog of movies if you are not registered.
Here is a quick trick: use Google Web Search.
Go To Google Web Search and paste the following text to the search box (it’s a search operator that lets you search a single domain).
site:primevideo.com
Then, just type the title of the movie or TV show you want to check. I recommend putting the name in “ ” quotes to see results that exactly match the title.
Via How to find which Prime Video titles are available in your country
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