PayPal is more convenient for paying on the net, allowing you to use credit cards and PayPal accounts, and provides Quandir the best return. Kagi offers more international support, credit cards and the ability to pay by check or cash. Kagi also offers you the option of purchasing site or world-wide license.
To pay using PayPal, click here: If you want a PayPal account, click here:
You can also register at Kagi.