I don’t often give you indications of places you should shop. It’s more about me and the kids.
But I got some birthday gifts and other things through a website called, strangely enough, Suck UK
Take a look. I got their cardboard radio because it is portable and takes an input from my iPod/iPad, etc. I got a paper watch that you can give a kid to draw on and decorate. There are a myriad of amazing, cool gadgets.
Suck UK is the website and they do the pound/dollar conversion for you.
Here’s a picture of the radio, but it’s not near the coolest thing there: