The walk costs 15 pounds, which amounts to $24. It charts the highs and lows of the royal courtship, from Mahiki - the nightclub where William drowned his sorrows after a temporary breakup in 2007 - to Westminster Abbey, where the couple will marry on April 29.
The wedding is expected to be a boon to British business, with one estimate saying the economic kick could reach $1 billion.
Meanwhile, Middleton may have made one of the most important decisions about her upcoming wedding.
Middleton's mother and sister reportedly spent 90 minutes at designer Bruce Oldfield's store, an indication that Middleton may have chosen him to design "the dress."
The identity of the actual dressmaker is a closely guarded secret. Oldfield's spokeswoman Monday refused to comment, and palace officials said the dress choice is a "private matter" because Kate Middleton wants to be able to surprise her fiance on their wedding day.
There have been earlier boomlets of speculation about Oldfield, who was one of Princess Diana's favorite designers.
The Associated Press contributed to this report.