You could try popping in to see a local naturopath as they might know of the best sources for ordering from within your country. One of the best things my naturopath did for me was share a number of local herb sources that I never would have found on my own.
I'm in Canada and I know well that ordering anything from the States can be extremely expensive and for whatever reason stuff from there seems to get stuck at our border for ages or just get lost completely. For us general online purchases from the UK are usually way easier for whatever reason.
Are there any good sources in Germany perhaps? A small local herbalist might be better able to order all the herbs you want and do a custom tincture for you which could be an excellent and affordable option.
I hope you're able to find a good workable solution for the long term. I know I feel much happier now that I've figured that end out.
Bulls eye rash August 2013
Started treating with Buhner herbs July 2017
Treating Borellia, Babesia and Bartonella as of November 2017