It's the game that many people play - trying to find the best Amazon (or Apple) store when they live and travel between countries. This means a constant struggle to find a combination of credit card, store with enough content (The US is best) and a local address (virtual and actual) to satisfy arcane internal rules.
Please Amazon - please move to one global store where any credit card from any country can purchase any edition of any book. Please Amazon and Apple, let us combine content from multiple stores into one account, and let us have a global price based on the best market. Yo usell more stuff, we but more as well.
Meanwhile take the chance to collect, and pay to the local authorities, consumption/sales tax based on the location of the IP address, not the credit card or address of the buyer. That way if someone is standing in the UK, buying content from the USA, then they pay UK tax (VAT), making it fairer versus the physical and local virtual alternatives.