Most of the books in Bernard Cornwell's Warrior Chronicles/Saxon Stories series are down to 99p today at Amazon UK.
(1) -
The Last Kingdom
(2) -
The Pale Horseman
(5) -
The Burning Land
(6) -
Death of Kings
(7) -
The Pagan Lord
(8) -
The Empty Throne
Books 3 and 4 are the usual price. They should be the focus of Season 2 of the television adaptation, so I suspect they're trying to catch people who want to get ahead with their reading.