This option is for institutions like libraries, universities, schools. You pay after receiving the DVDs.

Credit card

For the payment with credit card you are redirected to Paypal. You don't need a Paypal accout! Once you are on the Paypal page, just look for the link to the credit cards. It's quite inconspicuous on the right side of the page rigth below the Paypal login. Of course you can also pay with Paypal.