Becoming a member on Club Penguin for 1 month costs $7. You can only become a member for 1 month, 6 months, or 12 months, there is no five week category.
It cost £19.00 for a 6 month membership for club penguin
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It depends on how long you want your membership for.
There are many games like Club Penguin which you can do more with out a membership but there are none that are good with no cost.
The 6 month membership card is $29.95. By Gold Tommy from Club Penguin
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$7.95
£7.59
7$ A month.
3.95
For a year they cost $59.59 answer found on clubpenguin.com
I don't know what a 'curves membership' is, but you can get more information about membership on the Club Penguin website.