The 6 month membership card is $29.95. By Gold Tommy from Club Penguin
I think as soon as the people buy it the use the code so no one would have one unused.
It cost £19.00 for a 6 month membership for club penguin
It is unlikely for someone to go to a store and buy a club penguin game card, then just put it up online. But you can try looking.
A one month membership is $5.95. A 6 month membership is $35.00.
$1.99 for 1 month Club Penguin membership through Jan 30.
5$ for 1 month