Book is called Starters, amazing read. Finished it off in 2 days, enjoyed every moment of it. I highly recommend it.
Synopsis: The story takes place in a Dystopic, post-war America. The story is about a girl named Callie who is struggling to get by with her friend Michael and her brother Tyler. She does not think that they can survive for much longer, and thankfully there is a way out. An establishment called Prime Destinations is offering her a large sum of money to "borrow" her body.