I should add a detail on the power jack sockets. In the US, they are commonly called "coaxial power connectors". The outer diameter is 5.5mm; the inner diameter is usually 2.5mm. In my experience, the center pin for the 2.5mm type has always been positive (+). Check both the power ssupply and jack before ordering.
The second most popular inside diameter is 2.1mm. They aren't as common, so I would avoid them. I have seen some center negative (-) in the 2.1mm size (about 5% of what I've seen) which makes me shy of 2.1mm.
There are other sizes, too. I have a "universal" adapter kit which has nine different adapters. If you can, try to get 5.5mm outside, 2.5mm inside, center (+): you can't go wrong.
If you get a 5V regulated cell-phone charger (very popular and very cheap), its connection might be USB or mini-USB. Attaching most of these is usually straightforward, but some of them need a resistor so that they "know" they should turn on. Don't worry about that unless you encounter it. Instructions are on the net if you need them.