This one isn't a book at all, but a new television series from Discovery. This is a reality series, of sorts, but without the competive gaming features. It's on the Discovery Channel, if you can remember to watch or record it, or you can just get a free season pass using Amazon Video on Demand. The first episode, Arrival and SurvivalSynopsis
Ten volunteers enter an experimental post-apocalyptic world to see if they can survive and rebuild after a global disaster. Cordoned off in a downtown Los Angeles warehouse, they must secure shelter, filter water, and defend their new home from thieves.
One I am looking forward to reading isn't a "bargain" in the sense of being under $5, but at $9.99 is a great deal compared to the hardback (it just came out; wait a year and the price will drop more). It's Winter DutyMajor David Valentine and his fugitive battalion are the remnants of an expeditionary force shattered in its long retreat from disaster in the Appalachians. Between a raging blizzard, bands of headhunters, and the need to recover wounded soldiers lost during the retreat, Valentine is in for the toughest winter of his life.
And Valentine is losing allies fast. Some of the clans in the region have declared themselves in favor of the Kurians, throwing Kentucky into civil war. But the Kurian overlords have determined that the region isn-t worth the effort of another conquest. Their order: extermination.
I've mentioned Keith Knapp's MoonlightBook Description
It began with a power outage. A power outage that went beyond lights and televisions. Clocks stopped telling time. Cell phones no longer received signals. Cars became dead relics that wouldn't start.
As the world around them becomes darker, so do the inhabitants of the small town of Westmont, Illinois. A mysterious and evil presence has taken a hold over the village, making the once peaceful town a place of violence and despair.
A small group of individuals, untouched by this presence, must uncover the mystery of why they remain normal and discover what (or who) is taking control of their town, one soul at a time.
Because the Man in the Dark Coat is out there. Hunting them.
And not everyone can remain untouched forever.
Also in the Horror end of the spectrum is Gone, the DayBook Description
Mike wakes up to discover that darkness has consumed the world. No sun. No sky. No stars. Only blackness. Before he can question what has happened, or even his own sanity, great beasts swarm out of the void and begin a lethal assault on mankind.
No review of the genre would be complete without at least one Zombie Apocaplyse story (would that be the Zombocalyse?). The problem is, finding just one to include here. There is Braaaaaains
These are but a sampling of what is out there ... if you find any other bargain titles, be sure to leave a comment, so I can check them out. One I recommend you skip, however, is Patriots: A Novel of Survival in the Coming Collapse