According to ThinIce on the official forums, the following message was received by support regarding the inability for players to order game and upgrade codes for servers outside of their region: "We apologise for the inconvenience, however if you cannot currently see the option to purchase a US serial code, this will be changed in a few days. In the meantime, we thank you for your patience." [1] It now appears that the change to the stores was intended only to be a default, not to lock players into playing on certain servers. More updates will be posted as received.