As Halloween approaches, we thought it'd be fun to take a look at just how much Americans love to shop for Halloween. According to the National Retail Federation, about 158 million people will celebrate in some way for Halloweeen, and will spend $6.9 billion on those celebrations. Adult and children's costumes top the list of expenses, as does candy. But how about pet costumes and Halloween cards? Yep, people spend on that as well. Take a look a see how you compare.