I had a very unfortunate experience on eBay whilst trying to buy a flash gun. The firm was emilyandlily and allegedly based in Nottingham but it turned out to be an American company based in New Jersey. They claimed I had ordered two flash guns and then started sending totally illiterate emails to me. eBay weren't interested. They are clearly making quite a lot of dosh from emilyandlily and they don't want to upset them. If you try to leave negative feedback to alert other folk then you find the barriers are up and you can't do it. Knowing that a dealer is 98% genuine is, I'm afraid, not a guarantee of anything.