Here are a few examples: You can pre-order Erikson's Toll the Hounds at 30% off, while Reaper's Gale can be purchased at 30% to 35% off. There are discounts on all the Malazan volumes, by the way.
Some of the best bargains include Alastair Reynolds' House of Suns (45% off), Peter F. Hamilton's The Dreaming Void (50% off), Redick's The Red Wolf Conspiracy (45% off), and Joe Abercrombie's Last Argument of Kings (45% or 50% off). You can also pre-order Richard Morgan's The Steel Remains for less than 10 pounds, which seems to be quite a deal! Raymond E. Feist's Wrath of a Mad God can be bought at 42% off.
A quick search showed me that books by R. Scott Bakker are 25% off. Scott Lynch's debut and its sequel are 35% off. Guy Gavriel Kay's Ysabel is 34% off. Hal Duncan's Ink is 40% off. China Miéville's Un Lun Dun is 45% off.
Browse around and I'm persuaded that you'll find unexpected bargains that will make your "books to read" pile grow!;-) Click on this link to find out more!