Despite having to suspend my disbelief at the agreement that forms the premise of this book, I can't forget Unwind (Simon and Schuster, 2007) by Neal Shusterman. In this story abortions aren't allowed, but when kids are between the ages of 13 and 18 parents can choose to have them "unwound," where all body parts will be used. Of course, people always find a way to get rid of unwanted babies, in this case by "storking." This powerful story presents multiple sides of the issues. Meet the characters who will be unwound: Connor, because he's a trouble maker; orphan Risa, to save expenses; and Lev, a tithe dedicated from birth. Once you're hooked, you'll find it hard to put down.
See Neal talk about some of the inspiration for this award winning book here. Then check out this brilliant author's long list of books.