I see the problem ... Carlos, you're looking at the 'Pay by online check' option, (29.95 for 30 days, 59.95 for 90 days) which is only avaliable in US $.
Go back to the 'Join' Page and click 'Credit Card' instead. Then click the 'Euro'
sign. 23.33 Euros for 30 days / 46.69 Euros for 90 days...