Offer valid from the 19th of March until 31st of March 2013. The offer will deduct 10% from the total basket value when a customer selects at least £20 of print books at Waterstones.com. This offer excludes everything other than print books such as Kindle devices, eBooks, audio downloads and Kindle accessories. Offer can be applied to both full price and discounted books. Offer is not valid on Reserve & Collect orders. Offer only available at Waterstones.com, not in Waterstones stores. Single use only.