eBay is a bit of a problem, you can get fakes and they're quality. Conventions might be a good idea. We have a store called GameTraders in Aus that stock the legit quality ones, you're looking at $80 and up for a variety of things incl. Tidus' necklace and stuff. I don't know who their supplier is but if you check some quality gaming stores etc they might be able to help you find something nearby.