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Zulily has Halloween costumes for just $7.99! They have a selection available for $7.99 during their daily "Dash for the Deal" promotion, but they also have other costumes available as well.
Here are some of the $7.99 deals:
This is a Zulily deal. If you've never shopped Zulily before you will need to enter your email to see the deals at Zulily, but it's totally FREE and worth it. I've been able to find some many deals and unique items at Zulily that I'm always excited to see what they have each day!