Pandora's Box help pls!!

[exploding fist]

Where can I buy one and does anyone recommend a particular model? I am based in London.
Yes, I have looked on eBay but the range is baffling.
I know there are different types. I would prefer to buy one from a UK-based seller with some sort of warranty in case it goes wrong within a few weeks!
Any advice is gratefully received.

[zapiy]

I have a Pandora's Box 4 for my Arcade machine, it has 645 games I think, I have never had any issues, what are you looking at using it for?