Also, not sure if there's still a bounty on this, but I decided to post my user experience with http://dvc4giftcards.us anyway:

review for http://dvc4giftcards.us/

With some of the kindly tips I've received for the dvccountdown, I managed to have enough dvc in my pocket to purchase a $1 amazon gift card, which I was going to use to discount an amazon purchase I was planning on making. The site was well presented, and easy to purchase from, but I missed the bit where I was supposed to write a note to the seller. My brain just completely missed the text block, and I think that was because the big cards drew my focus away from it - perhaps it would be better presented another way, like a message box or something just before going to the payment window. Regarding that oversight, I assumed (hoped) the gift card would just be sent to my email address by default, and overnight I received an email from the site admin. It turns out they had seen that I was from .au, and the gift cards were only usable on the US store. I was asked whether I still wanted the card, or a refund, and took the sensible option considering I was looking at something on my local amazon. The next time I want something from the US store (which I do from time to time), and I have DVC to burn, I had a pleasant enough experience to try this site again. For larger purchases, though, I think would prefer bigger denominations than the $1 or $10 to save some time.