I think nearly everyone has something that needs to be charged via USB from a kindle to a tablet or smartphone, so I have decided I need to invest in a charger that can be plugged into the mains. It also needs to be small, and easy to carry. I used to use my laptop, but I think that has killed my battery, so I am looking for one that is international so I can use it when I travel. I've seen one for £20, but am hoping people will have seen some other ones available. Any ideas?