I've grabbed about 5 connectx-3 cards last year for less and i'm based in the EU. Mostly from germany btw.
This seller was also selling back then, and also excluded because he is unreasonablly expensive.
Maybe currently there are temprorarily no cheaper alternatives, but that doesn't make this a good deal.
Yeah, price fluctuations are indeed a pain sometimes. I am in Germany too and as an example the price for a certain Samsung DDR3 ECC RDIMM modules with 32 GB is somewhere between 40 and 80+ Euros over time. So if possible it might help to just wait a little bit.