(England Twitter)-Oyster cards cost £10, of which half is a deposit for the card and the rest is used to pay for travel around London. The cards can be topped up indefinitely. The royal wedding Oyster Cards will be extremely popular among tourists who are planning to travel to the capital to watch the historic event, the commemorative Oyster Cards will be a perfect souvenir for tourists and people living within the city of London.
Card is used on the public transport system in London and features a picture of Prince William and Kate Middleton with the date of their wedding on.
Around 750,000 of the cards have now been made available for commuters and visitors alike to London's mayor Boris Johnson said: 'Just as royal wedding fever starts to take hold in the city, this fantastic commemorative Oyster card is a great chance for Londoners and visitors to have a slice of the action as a fabulous memento of the happy day.
Commemorative stamps to mark the wedding of Prince William and Kate Middleton have gone on sale, just over a week before the big day.
Produced with the approval of the monarch and involvement from William, they feature William and Kate's official engagement portraits taken by fashion and celebrity photographer Mario Testino.
Royal Mail said it is expecting strong demand for the collectibles, with its website already receiving thousands of visitors from the UK and around the world wanting to find out more about the stamps.
Stephen Agar, of Royal Mail, said: "It is a great honour to commemorate this very special event through this set of stamps. As the nation gets set to celebrate we are proud to be able to offer this everlasting reminder of such a historic occasion.