How to support an author beyond buying books
Author and Illustrator Debbie Ridpath Ohi (also known as Inky Girl, or @InkyElbows) has a fabulous website chock full of kidlit resources and advice, as well as info about her own fantastic books and artwork.
As much as authors love it when readers buy their books, there are still plenty of ways to show your interest and support for a title without spending a dime. Check out Debbie's helpful post here.
YA Author Erin Bowman also posted a great article on Pub(lishing) Crawl about the same topic. Check it out here.