Originally Posted by LewDog
Apparently there is one ($35 for 3 days unlimited in Zone 1) that you can only get outside of the EU
But you can get a Zones 1
and 2 one-day Travelcard, including peak travel, for £5.30 ($9.85) when you get to London - this is the standard rate.
And if you're not travelling until after 0930, it's only £4.30.
Either way, cheaper than the $35 for 3 days, even without the delivery charge.
Current Travelcard prices are on
this page.