The small Italian-made CBA I mentioned above, I bought about 15 years ago from this dealer in Germany. They appear to have more than one brick and mortar locations, and they have this big website listing a ton of brands you can click on and see what they've got on offer at the moment. With that purchase they wanted some kind of authorization document and there were big duty charges--those eat up the VAT deduction, so you don't want to buy something with no VAT deduction, and take a hit on currency exchange, duties/custom, and shipping on top of it.
The bottom line is that there is a cosmic unfairness and struggle with finding and shopping for accordions. They are so unavailable to try in any variety, and so far from where one lives that there are big challenges, aren't there. Of the very few dealers in the US, few are anywhere I wish to burn all-too-scarce vacation time and money flying to in order to use up precious time off in an accordion store you can't saunter into a reasonable distance from home on the weekend. It's challenging.
www.akkordeoncentrum.de