Hiya!
Remember, if you bring over a US dvd player, it'll only playback US region 1 DVD's. It may have a feature where it can playback region 2 (UK and euro ) dvd's but you'll need to check the specs of your unit.
DVD players like this dont use 110V to work, they use an adaptor which converts to 12V (usually). 2 things with this, you can check to see if your adaptor has the detachable type 'figure of 8' cord. If it does, you can get one here which has the UK type plug on the end for a few pounds. If it's non detachable, you could use a step down transformer to take UK 240V on one side and provide a US 110V output on the other. Then you simply plug in your US connector/adaptor to it.
It's the same with the PS2, you'll need the UK figure of 8 power cord to plug it in. However, I 'think' US PS2 units will output into the US NTSC system for video output, which wont work on UK telly's. However, some tellys here have 'NTSC playback' which will 'show' the US picture correctly. I may be incorrect on this, and it may be worth talking to a Sony centre to find out for sure.
As for buying items check
www.maplin.co.uk ebuyer.com, dabs.com, amazon.com, argos (high st shops) dixons etc etc... they all should have various PS2 and power cables
Hope this helps!
Dennis! West London & Slough UK!