Q:Would you please tell me where the shops are to purchase bus saver tickets? Am I able to purchase them online? We arrive late on a Saturday so won’t be able to buy them until the Sunday. This is such a great site and has been so helpful for planning our short 3 day stay. Thankyou.
A:Yes, you can buy London Transport tickets online from some countries. I suggest you have a look at this web page for Transport for London. It provides information on the various types of visitor tickets available.
http://www.tfl.gov.uk/tickets/faresandtickets/1067.aspx
Judging by your email address, I am guessing that you are in Australia. Here is the link to how to buy tickets online for Aussies.
http://www.ticket-on-line.com/cgi-bin/web_finder.exe
You can also buy tickets when you arrive, from most newsagents and from any tube station. I think you could even buy them from the airport when you arrive. Or simply go to the nearest tube station on the Sunday morning before you start your sightseeing.