Where to buy a Eurostar train adult discount ticket?

Question

Where to buy a Eurostar train adult discount ticket? thank you!

from Paris to London

Answer 1

On their website (link below). There's a spring sale right now, 66 euro r/t.

You can also purchase through a travel agent, perhaps for the same fare (perhaps with a minor fee). This is helpful if you need the ticket right away.

Answer 2

or you can buy them directly from any SNCF agency.

Answer 3

Try:

http://www.eurostarbooking.com/

I googled "Eurostar tickets"