Is this the article ?

http://www.online-literature.com/dickens/uncommercial-traveller/22/

If so its hopefully available from these sellers, personally Amazon is always my first source of possible book sales etc.
http://www.fantasticfiction.co.uk/d/charles-dickens/uncommercial-traveller.htm

Especially as you can sometimes learn usefull stuff prior to buying, if at all...this one let's you read some of it online.
http://www.amazon.co.uk/Uncommercial-Traveller-Oxford-Illustrated-Dickens/dp/0192545213...