I tried just now and got the same problem, but it was OK when I tried again a couple of minites later. It's normally OK.
The other news is that PayPal now accept international users (I got the notification email about ten minutes after posting my last message!). Web site payments are billed as "coming soon" for international accounts, but the rates look very good -- 25c + 1.9%
If anyone hasn't got a PayPal account yet, you may as well sign up for one -- it doesn't cost anything, and if you use this link
, FutureQuest gets five bucks!