The links below contain affiliate links for The Book Depository for which I would receive a commission should you buy anything from the site.
10% Off at The Book Depository
The Book Depository is offering a 10% discount on everything (both books and ebooks) until 14 May 2012. They offer free shipping worldwide. To make use of the offer simply click the link below and follow the instructions.
The .uk and .com site might have different prices, so be sure to check which one has the best price for the item you want.
10% Off at Bookdepository.co.uk
10% Off at Bookdepository.com