Try this at Amazon.co.uk (look for the yellow ones):
http://www.amazon.co.uk/s/ref=nb_sb_...&sort=daterank
or this at Waterstones:
http://www.waterstones.com/waterston...ultsPerPage=10
And all at either £5 or £3. Nice! At those prices I don't mind (as much) re-buying stuff I already own on paper.
Andrew