Sorry to hear about that! 200 Euros for shipping does seem a little extreme, but don't let it put you off finding another solution to towering your Amiga, it's well worth the effort.
Why don't you just go for the keyboard interface and if you can stretch to it a Mediator? Tower cases are very heavy things, so it might be a better idea to build your own.
I'be built my own case in the past, and while it isn't as easy as building an Airfix kit, it's certainly well worth the effort.
Paul