Hi Kuja,
I'm in a similar situation to you. I'm in Ireland, and there isn't too much in the way of authorised dealers, and they don't have much of a selection when it comes to the limited editions.
I took a punt on a seller who had 100% feedback and a couple of hundred feedbacks (at that time at least). Item seems genuine, but to be honest I don't have the experience to be sure, I put a couple of questions on this forum and was reassured, but unless I brought it into a boutique I can't be positive it is genuine. However, I left positive feedback without having proof the item was in fact what it claims to be, so 100% feedback is no guarantee of authenticity.
I'm not sure if I should leave the name of the seller here due to previous comments on this thread, but you can pm me if you want the name of the ebay seller. As I said, this is only my experience and I can't even be 100% sure of what I have, so this could be advice from a grade A chump!
The only way to be sure is to buy from an authorised dealer. Best of luck.