Interesting...it was grayed out and not selectable when I tried to order...
edit to add: I wonder if that's an Illinois vs Wisconsin thing...
There are a few items that are blocked by Paypal because of copyright issues, etc., so you'd need a different pay method for those.I placed my most recent order five days ago, and paid with PP.
When you hit "Secure Checkout," it didn't allow you to pay by credit card? The thing about their credit card system is that you have to send them a picture of the card - dunno how comfortable you are with that - but maybe it's something you might have to open a ticket up for to arrange in advance or ask how to proceed...
Or you can use PP to buy a gift certificate and use that to pay for your order.