Almost impossible task to find a company, that would allow such rental and drop off location. You'd better think of individual rentals in each particular country.
Thank you Phil. Can you perhaps recommend a particular company for any of the countries, please?
In Bulgaria you can try Top Rent a car. Of course all major brands are also present in the country - Hertz, Avis, Europcar, Budget, Sixt etc. You can also check the autoeurope.com website for the best online deals.
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