Asking for different shopping fees and taxes should not be illegal anywhere.

The price itself could be more tricky. Of course it highly depends on your jurisdiction, but i some this would easily racial (or ethnical or whatever) discrimination.

Also I'm almost entirely sure that this would be a violation of the "one market" principle (and therefore illegal) of the EU if you operate from the EU and distinguishes between two EU countries.

But I'm not a lawyer or ever tried this.