Smashwords is running a great deal for the month of July, with many of the titles they carry only costing half as much as normal, or in some cases even less.
All you have to do is go to a book's smashwords website, and look underneath the "download" button to the right- you'll see a special code to enter that will enable you to get the promised benefit.
Several of my books are included (click on the links):
Bound for the Promise-Land (Spur Award winner)
All Great Neptune's Ocean
Check 'em out!