Thanks for the link! The site says they will mail if ordered 16 + days out from the US. I'm going Aug 13, so just barely make it. I wonder if I'd be better off to wait til closer in, and force a will-call. My daughter has a friend in Germany, and their letters often take a full month to go back and forth. Bummer that we won't be there at the same time! One of these years, we WILL meet up on our journeys! I will put AAA on my list of errands for next week. I read on the underground site that the visitor's pass is good for zones 1 & 2 - I think Windsor is in zone 2, so that would be really helpful. Especially if it does not limit us to traveling at off-peak times. We'll want to catch an early train into the city on the days we go in. I'm especially excited about surprising DD with this trip. She is off at camp until the day before we leave, so it will be easy to keep it a secret.