After a little more examination of the details, it seems about half of what I have to pay extra is import tax, which I suppose is what it is. Likely nothing to do about that, although I find it very annoying that I am not informed about this when I make my purchase.
The other half, or in fact a little more than half, is just the postal service charging me for figuring out how much import tax I have to pay. Apparently it differs a little who gets to do that and how much they each charge, and also it's not entirely clear to me when I have to pay import tax and when I don't. But either way, the local postal service charges outrageous sums for telling me how much I need to pay.
This seems to go back many years and seems it's had politicians very concerned about how it negatively affects international trade (I only have to pay import tax if I buy outside the EU), but politicians are apparently quick enough to voice their concerns but take forever to do anything about it.
So I don't have much hope. Especially because I'm not a terribly well-connected person who could get any kind of campaign moving. I'd get, like, maybe 5 signatures if I tried. It'd be pathetic