Unfortunately, we have a lot less info on getting octos in the EU... in general, the "octopus availability" thread is where we track sources for octos, but it's rather US-centric most of the time. Colin sometimes gets them in the UK, and may be of some help. They seem to do well if shipped properly, so if you can find someone willing to do fast international shipping, that's not impossible.
Hi, there are quite a lot of threads about Wunderpus on this site regarding the ethics of their collection and maintenance in captivity. Give the forums a quick search and you will see that it really isn't an ideal species for selling.