I tried to buy an ebook from B&N as a test. I used the USUnlocked Billing & Shipping address but my UK Diners card. It failed. The error says "This title is unavailable to download. Either your payment method was declined, a refund was issued, or charge-back was applied to this item. Contact our Customer Service at 1-800-THE-BOOK (1-800-843-2665) for details."
I then bought a $10 egiftcard and sent it to myself, this worked fine, payment accepted etc. Only problem was the book cost $10.76 with the sales tax!!!!!
So it is stuck, because they can't take the extra 76c from my Diners.
I'm definitely going to get this to work