A few Jo Walton books on sale:
*
My Real Children - $2.99 -
Amazon.com - historical fantasy with parallel lives.
*
The Just City - $2.99 -
Amazon.com - science-fictional experiment by a time-traveling goddess to create the ideal society described in Plato's
Republic. First in a trilogy.
Steel Beach by John Varley is $1.99 -
Amazon.com - all I know about it is the famous first sentence.