Until the end of the month, all of my books are on sale here.
You may find something interesting, or from someone else(It's a site wide sale). Note, grabbing someone elses book after following that link does fire a few pennies my way, so it's a win/win situation! Three flexible books are available, and can be downloaded to all popular ereader formats.
Coupon Code: SSW25, except Heroes of Space, which is currently 50% off, SSW50
You have to put in the code for each book.