[header] How to use an oyster card [title] Purchase your oyster card. [step] You can purchase an oyster card in a number of places across london. All tube, london overground, and tfl rail stations have them available. 
In addition, hundreds of newsagents and shops in london can act as oyster ticket stops, allowing you to buy or refill a car. Transport for london (tfl) even has an oyster ticket stop locator on their website : [title] Oyster cards have a £ 5, non-refundable activation fee that is due at the time of purchase of a new card.