Rental Prius in Munich?

I have googled as best I can but I cannot determine if it will be possible to book a rental Prius when I am in Munich (rental from the airport) next month - does anyone have any experience with Toyota rentals in Europe? I have also discovered with many rental car companies, if I book online and use my address in Japan, prices quoted are higher than if I use my Canadian address...Wth?

I have a month of lead time so I hoping this works out.

Jef