Any most gaming shop will sell them/ and or if you got the game offline (in a store) go back there and they would should sell them, if you live in AUS you can get them at EB games, if your in the US there is gamestop/(or any other gaming shop, I don't live in the US so I dont know many others) if you still can't find any try going into a game shop and asking if they know of any places. I hope this help and your able to get some time cards. Just rember time cards coast more then getting it over the internet.