I'd keep an eye on that site for cheaper copies, there is already one.
I'm not sure why it hasn't been printed in America. I emailed the publishers Faber and Faber or whatever several years ago hoping on the off chance they still had copies or were planning a reprint to coincide with the release of the film on dvd, which was supposed to be over two years ago, but I don't think I ever got a reply. Though I knew a reprint of such a small title is very unlikely.
Right now I'm just still waiting for the blasted dvd, you can't just drop it completely after having a release date special features cover art and everything and not at least give a reason! Gah.