Right now (yes, now!) Amazon has the Kindle edition of Consider
Phlebas available for $.99. If you like space opera,
Banks's Culture novels are generally a pretty good bet and while CP isn't my
favorite, $.99 is a smoking deal. If you have a Kindle, that is. If not,
the price is a somewhat less attractive $114.99 (and that's if you like ads).

Barnes & Noble has it also for 99 cents at bn.com, if you'd rather get it in epub.