I got Nevil Shute's autobiography at Kobo at a decent price; $CDN 3.99 - the PERKOPOLIS discount (about $2.50)
http://store.kobobooks.com/en-CA/ebook/slide-rule-4
The downside is that the version I got was downloadable to a device only (reading it on a Galaxy Tab), and may possibly be available only in life+50 or less countries. There is also an AdobeDRM version available, but much more expensive and probably non-discountable at $14.99