I had a great experience on ebay. i bought a 30 vache grain lisse in grey, mint, under retail ( 1500 E) and of course, 100 % authentic. it was a lady, not a store, and she gave me plenty of information, but i decided after consulting the "authenticate this hermes" threat. i thank a lot all the help from the members.
the day that i received the bag i went to hermes to check the authenticity, and i was lucky to find a 35 gold togo, that i bought that same day!
i recomend ebay, but only if it is dheaper than the store... prices are mad from some retailers...