My post-apocalyptic alien invasion novel, Thunder Wells, and David Wood's post-apocalyptic zombie novel, The Zombie Driven Life are both currently available for free through a host of ebook vendors.
Both are packed with action and adventure. David Wood's novel is filled with dark humor and appropriate for young adults on up.
Link for Thunder Wells: Where Thunder Wells is Available
Link for The Zombie Driven Life: Where The Zombie Driven Life is Available
Check them out and get your copies while they're still discounted to free!