There are several locations where you can purchase an Oyster card at Heathrow Airport Terminal 2:
Oyster Ticket Stop: There are two Oyster Ticket Stops located in Terminal 2, one in the arrivals area and one in the departures area. These kiosks allow you to purchase an Oyster card and add credit to it using cash or a credit/debit card.
Ticket machines: You can also purchase an Oyster card from the ticket machines in the Tube station inside Terminal 2. These machines accept both cash and credit/debit cards.
Retail outlets: Some retail outlets in Terminal 2, such as WHSmith and Boots, also sell Oyster cards.
When purchasing an Oyster card, you will need to pay a £5 deposit, which is fully refundable when you return the card. You can then add any amount of credit to the card, starting from a minimum of £5.
Once you have purchased your Oyster card, you can use it to pay for travel on the London Underground, Overground, buses, and trams. You can also use it to pay for certain other services, such as the Emirates Air Line cable car and some riverboat services.