I am looking on the replacement section of the Xbox website to get a new Xbox 360 Slim Power Supply Brick. However, I am not having much luck. I get to stage 2 (billing) and either nothing comes up or there is an error. I'm just wondering if I can walk into a gaming shop like GAME (I'm UK) and ask for a power supply as I'm not that keen on buying a cheap one off Amazon. Is this possible?