I'm reluctant to post the work of a man who flouts common decency by getting his names completely the wrong way round.
Walker Percy
Love in the Ruins: The Adventures of a Bad Catholic at a Time Near the End of the World for $2.99 at Amazon.com
Here a couple from Stanislaw Lem. A very Polished writer. The ASIN has been changed on each of the following. Check your content before purchasing.
The Cyberiad: Stories for $1.99 at Amazon.com.
A Perfect Vacuum for $1.99 at Amazon.com. Not necessarily SF but everyone needs a good vacuum cleaner. How much more so the perfect vacuum cleaner.