I wrote an article that has been posted on book-editing.com about entering contests to win money, increase exposure, win other prizes such as actual publishing contracts, and more!
Take a look here:
I've been an editor for the Next Generation Indie Book Awards for several years and know how powerful winning such a contest can be to stimulate sales and promotion of you book. This particular contest accepts submissions in more than 70 categories, so there are many opportunities to be a winner or a finalist of record.
Take a look at: indiebookawards.com