I was smart this time. I bought a Kobo gift card first from the Australian website. Interestingly, Kobo did send me the email receipt for the card. AUS$20 came to US$17.86. I furiously grabbed 11 books for less than $10.
Shopped from Australia, India and South Africa although the prices were only pennies different I had to move due to availability. It wouldn't let me buy from US, UK or Mexico using the gift card.
Edit: Thanks for posting the code