I need to get Eurostar Italia tickets from Paris Bercy to Florence. I live in the US, and I have read about some people are able to get it completed. My problem is there is no option for ticketless tickets. The only ticket option is home delivery. The site will not allow me to enter my US address. The cost with exchange rate is $415. If I book from Rail Europe, it over $700. That is too expensive. What are some other options?

Where are trying to book it? The French rail line? You would not book it through Trenitalian since it starts in Paris. Or am I missing something in your question?

Yes it is starting in Paris. Which site should I be booking through?

http://www.voyages-sncf.com/

Perfect! Thank you. That's what I was looking for.