Paypal:

We frequently get asked why we do not accept PayPal.  We are currently not set up to handle that type of transaction. But, you can still use your PayPal account to make payments.  One way to do this is to get either a PayPal Credit Card or a PayPal Debit Card.  Paypal 

correct url (for now, until paypal moves it again) is:
https://www.paypal.com/us/cgi-bin/webscr?cmd=xpt/Marketing_CommandDriven/general/NewPayPalPlugin-outside&nav=1.3.2

I've filed a feedback asking them to stop moving it around, or give us a landing page we can link to. Should it move again, the directions to find it are:

goto paypal.com
click "Products & Services" tab
click "PayPal Plug-In" in bottom box

Virtual Card Numbers:

For those that do not want to give us their credit card numbers, a lot of card issuers including Paypal offer Virtual Numbers.  These are one time use credit card numbers.  Customers should contact their card issuers to find out if this is a service they offer.
 

Gift Cards:  

Some retailers now sell Gift Cards that can be used for online purchases. 

VISA

Buy them in person

Western Union offers a prepaid card option for some countries.