All of Winston Churchill's books currently published by RosettaBooks, including his Second World War series, are on sale for $1.99 each through the end of the month.
There are 45 books total so I'm not posting individual links, but here's a link to Amazon.com's listings...
http://www.amazon.com/gp/search/ref=...ks-Submit.y=13
...and here's a link to the Churchill page at RosettaBooks...
http://www.rosettabooks.com/infocus/...ll-collection/
http://www.rosettabooks.com/pressrel...l-ebook-deals/