A fair number of Robin Hobb's books have been discounted on Amazon UK in advance of the next book in the Fitz/Fool series. The first book in each trilogy is £1.99, the second is £2.99 and the third is £3.99. Except for the most recent series where the first two are £2.99 and the second two are £3.99.
http://www.amazon.co.uk/Assassins-Ap...rds=Robin+Hobb
http://www.amazon.co.uk/Fools-Errand...rds=Robin+Hobb
http://www.amazon.co.uk/Ship-Magic-L...rds=Robin+Hobb
http://www.amazon.co.uk/Dragon-Keepe...rds=Robin+Hobb