I've used AbeBooks.com before, and they're great for finding hard-to-find editions. The sellers on there also have quite a good reputation, so they won't rip you off - if they say an edition is in good condition, it will be.
Just had a quick look for ya, and it seems they have what you're after for about a fiver...
http://www.abebooks.co.uk/servlet/Se...&x=52&sortby=2