What other payment methods show on the payment details screen on your account ? You can only use what is shown on that screen.
Changing payment info : http://support.apple.com/kb/HT1918
Depending upon what country that you are in then you might also be able to get iTunes gift cards are use those as your payment method - they are not available in all countries and they are country-specific (they can only be redeemed and used in their country of issue).
If you don't have any of the other payment methods shown there and gift cards aren't available, then do you know anybody else with an iTunes account in your country so that they could gift the album to you and you give them the money for it ?
Gifting : http://support.apple.com/kb/HT2736