Question: how much are oysters cards?
Answer: A Visitor Oyster card costs £5 (plus postage) and is pre-loaded with pay as you go credit for you to spend on travel. You can choose how much credit to add to your card: £10, £15, £20, £25, £30, £35, £40 or £50. The credit on your card never expires - it stays there until you use it.