how does one know if a retailer is carrying real or fake? it's not as if they're standing out on the streets of manhattan outside the conde nast building. a friend just went into an independent store ("boutique italy" at the great mall in the bay area, i think) and she said that he was selling a fake stella for $650. how does one know if it's real or not? i suggested that she can contact marc jacobs headquarters to see if they sold it to this store, but there's also the problem that they might be doing the business as DBA... any thoughts??