It's more than just candy and costumes. For retailers, Halloween is the final stop before the crucial holiday shopping season. The holiday will ring up billions of dollars in sales, but retailers hope certain trend lines will look more sweet, than spooky. The National Retail Federation estimates Americans celebrating Halloween will spend an average of $74, adding up to $6.9 billion dollars overall—including $2.1 billion on candy and $2.5 billion on costumes. That’s actually a drop from last year—when spending was expected to reach $7.4 billion dollars. According to experts consumers should spend early. Because consumers waiting for last-minute deals, will probably find the basics. But, the season’s hottest costume trends may move quickly, so last-minute shoppers, may not find the best selection.