Shopping bewilderment

So I stuck to my goal of not going shopping for two months. It was hard. I got a gift certificate for my birthday for the bookstore, and I am completely overwhelmed as to what I should get. I spent some of it and got a couple of books and a nice coffee mug, and a puzzle (I haven't done a puzzle for AGES). But I don't know what to get with the rest of it. After you don't have extra money for a while it's terrifying when you do.