Does anyone know how to buy them in Europe?
Given the strong anti-science anti-GMO sentiment in Europe, the company probably will not even bother to try to apply for a permit from the European regulatory agencies.
Given the reaction time of politics and the industry I consider that a good thing.
If you want to see strong anti-science look at the current US administration.
When it comes to GMO plants, Europe is anti-science.
European Commission had a Chief Scientific Adviser, but they happened to choose a plant biologist for the role [1]. Then she dared to speak the scientific consensus about GMO plants (they're safe) [2] and EU decided to close the whole role [1,3] to get rid of her.
[1] https://en.wikipedia.org/wiki/Anne_Glover_(biologist)#Europe...
[2] https://www.aei.org/articles/aaas-scientists-consensus-gmo-s...
[3] https://www.newscientist.com/article/dn25957-dont-scrap-euro...