Germany? Holland certainly, but I don't think many come from Germany.
Most of the bunched plants and cheapo rubbish comes from Thailand with a British middle man agency simply sending stuff on the quality is often very poor as are quantities most pet shops act in this way but without the mail order element.
Aquatic magic have always been very good for me, the portions are small but once they're growing they do well, I placed a big order with them a few years back and didn't receive a single dud plant, arrived quicker than the plants I ordered from within the uk too if memory serves.