To purchase digital games from Amazon US, use your UK Amazon account, and add a US billing address to your account. This address needs to be a valid US address, but nothing will be sent there, and you can access all your games through their website. Some card issuers may charge a fee.
Registers on Steam.2
Persona 2: Innocent Sin & Persona 3: Portable, PSP/ PS Vita – £14
Or just get Persona 3: Portable for £8.75.0