If you have a Paypal account linked with your debit is quite simple.
1. You need a friend who plays tanks with a Paypal account .
2. Choose send money and add your friend PayPal email.
3. Your friend receives the money instantly, you also pay a small fee.
4. Then your friend send you the package/tank/whatever as a gift.
5. An other way is to have two different PayPal's accounts but with 2 different debits linked and send from one to another.
6. Last option is that Top Up thing. You don't choose instantly (the one who gives you the warning) but the other option. The you have PayPal's IBAN . You can send money there via e-banking wait some days and then you can buy with your PayPal balance.
I hope that helps