There are a good few ways to buy books from me directly, but the best way to support me is to buy them directly from here. That way I pay the least amount of commission to third-party retailers. And remember - please share my books and review them on sites like Amazon, because that's a great way to grow my visibility to the world.
Paperbacks are UK shipping only at the moment (Or you can buy them on Amazon for shipping worldwide). eBooks will give you a download link in pretty much any format you need. (Proces will be shown in US$, but you;'ll be charged in your regular currency - I don't know why Gumroad does this but I can't seem to find a workaround yet).