Thanks. I bought my tickets from the official website. Just FYI to those trying to get the underground tour, it is only in Italian and was only available as single tickets because the resellers buy up those 24 euro tickets and resale them for $127pp. I did get the arena and super pass tickets without problem (also24euros) and the granddaughters go free. We'll get their tickets at the "reservation line" either inside the colosseum or the largo della office. All the tickets are name specific and ID must be shown. The tickets show that the palatine hill entrance is available (for the hill) if you already have your tickets.