tmmlrd:
Many thanks, I'll see if I find something similar in Europe... otherwise I'll try ordering oversea. I know it would take 3-4 weeks, but could still be compatible with my development time (delivery for Crhsitmas! :P).
Thanks to all.
Adafruit has European distributors that should carry this specific item, check the tag marked "Distributors".
Edit: Also if for some reason you can't find a European supplier of this or a similar cable, you can always order a panel mount female B and standard male USB connectors, along with a small spool of the appropriate cable, and make your own extension cable.