Smashwords, which functions as a store AND as a distributor for other things like Kobo, Diesel, Apple iTunes store and a couple others, is having a site-wide book sale. I've opted into it.
Blue Ghosts is free and both Planet Bob and Gray Fox are on sale. It's a great chance to pick up a copy for cheap.
The sale is only going on until the 9th, so if you're interested in either book, now's the time to go. What are you waiting for? GO! GO!