Angry Robot books, publisher of many Science-Fiction and Fantasy titles, is offering 50% of it's catalogue until May 9th if you buy two or more e-books. Perfect if there has been a series that you've been waiting to buy. It doesn't look like this offer is open to Kindle owners who have to purchase through Amazon. It's all in honour of Lauren Beukes' Zoo City winning the Arthur C. Clarke award.
From Angry Books
To take advantage of this offer visit the website and enter clarke11 at the checkout.
Angry Robot's twitter feed with offer details can be found here.