Because i dont have credit card or..... any paypal!

I would send money true this:

Pay by sending CASH IN AN ENVELOPE. Select this option if you do not have a credit card or PayPal account. Our mailing address is in the U.S. and detailed instructions on how to send the money will be included when this option is selected. Please allow up to two weeks for processing. Postage would could cost extra around 5 € for a registered mail. But i think its safer.....

So what would you guys advised me to do? Risk it or pay the 5 €?

Thanks and a happy Christmas

That would be around 49 €^^ Price its quiet good for the service that ones gets. I would have payed more.....
So now My Question. Its airmail safe?
Should i send it by register mail?(extra Cost but it maybe safer)