Mine (Reeds 2008) from Brown's Books, I forget which. Amazon.co.uk, search for your title, scroll down for the "new and used" section and pick one. I think it cost me £27.50 this year, so someone isn't making much margin.
maybe Tess Cosis-Cheepa? Not really - same book for £33.34 from them.
Reeds 2008 at the Book Depository for a fraction over £26, free delivery. No connection, but I've just used them and they really do offer a good service.