The Amazon.com site has always had problems with inconsistent internationalisation. Viewed from New Zealand there are some parts which show the US price/availability until I go to buy the book when it is suddenly not available or the price increases because it realises that I am not in the US. The Author pages are one of the problem areas, the search pages are also affected. Reporting the problem to Amazon many times over a number of years has not lead to any fix.
in the OP's case it seems obvious where the problem lies: reader wants to buy the book, author wants to sell it to them, but Amazon stands in the way.
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