You can easily pay using a debit/credit card, WITHOUT having to sign-up for PayPal.  After you click the Buy button, you will be directed to a screen that looks something like the below screenshot.  The wording may differ slightly, but you can pay directly with your card (and not have to create a PayPal account) by clicking the link below the sign-in box.  It will say something similar to “Don’t have a PayPal account” or “Pay with a debit or credit card”: