The differences between an Apple II and a EuroApple II is the keyboard and the Character ROM. Just like the Apples sold in Spain and South America. Other than that they are electronically the same. It is not that rare of a machine, except in the USA (like the Color Classic II sold in Europe and Canada and PowerBook 2400 series sold in Japan). It depends on your location. Even Chinese and Russian Apple II Clones are electronically the same except for the cases, keyboards and Character ROMs and are not that rare in their native areas but rare outside these areas. My friend Dr. Levinson collected Apple IIs and their clones, owning a couple Chinese "Orange" and "Pineapple" Apple II Clones.

I am no expert in figuring out prices in Apple IIs, especially in Ebay-Europe. But the prices in the links you shown are up to par with the mid to high end of prices here on the Ebay-USA. 450€ / $505USD for a IIc, even complete Is a bit high I think. Shipping it will be expensive.

Good luck on finding what you want and need.