The thing is that in other occasions I believe I have bought DRM-free music from Amazon Spain. But those particular albums weren't available in Spain, and although I found them in the german Amazon, I wasn't able to purchase them. I assume that it was a matter Amazon only being license to sell it in some regions (side note, I'd rather not buy from Amazon. I was ready to bit the bullet because it was the only place I found them, after about two hours looking for alternatives, but even so, they didn't let me pay for it). Just another way in which copyright management goes directly against the user, I guess.
Yes, I know that fortunately there are many ways to pay for DRM-free music (I mentioned that I use Bandcamp pretty often). What I miss is the vast amount of content I had available 10 or 12 years ago; I have been able to buy a lot of music, but there is much more that just isn't available.