I'll arrive to stansted airport and my hotel is near blackwall. I'll
stay in london for a week so i need a 7day travelcard and I'd like to
buy a paper travelcard to use 2for1 vouchers. A friend suggested me to
take national express coach to stansted, then the jubilee line to
canning town and finally dlr to blackwall. In a previous post you said
in Stratford i can only buy oyster travelcard. So where can i buy the
paper travelcard?

Thanks in advance