LONDON (AP) _ Commemorative London travel cards bearing the image of Prince William and Kate Middleton are going on sale this week.

The 750,000 cards are the first limited edition version of the Oyster Card, which is used for electronic payment across London's bus and subway network.

They feature a photo of the prince and Middleton and read: ``To commemorate the marriage of Prince William of Wales and Miss Catherine Middleton 29 April 2011.''

The cards cost 10 pounds ($16), of which half is a deposit for the card and the rest is used to pay for travel. The cards can be topped up indefinitely.

They will be available from Thursday in London subway stations.