Ahhh, you lucky ducks...
Looks like most of Ellis Peters' Brother Cadfael books are 99p on Amazon UK (they're also in KU.) Also seem to be multiple publisher versions - Head of Zeus are on sale.
http://www.amazon.co.uk/s/ref=nb_sb_...2Cdigital-text
ETA: not on sale on Kobo UK (least not now)