My contact at Kobo told me they use IP address to determine location for people who are not logged into the site, but once you log in it uses your saved info. So if I go visit my sister in California and browse the site without logging in, it will show me the American stuff in US prices. But if I log in as me while I am there, it will turn over to the Canadian content and prices and I can buy off my regular account just as I do at home---and presumably with whatever taxes or surcharges I pay at home
