It is no longer possible to buy photo books from iPhoto at all in any country.
Apple stopped the support for print products from iPhoto and Aperture a month ago.
You can only order Photo books using the Photos for Mac application. See this link: https://www.apple.com/osx/print-products/
If you need to print a finished photo book from iPhoto, save it as a PDF file and upload it to a different Print service, for example Presto Photos.
See the link below on how to save the PDF file for printing with PrestoPhoto posted by PrestoMeghan:
Re: Re: how to export a book made in Aperture to make a similar book in Photos?
In this discussion are also reports by kgem and Astro7x about the first experiences with this service.