This deal has ended.
Update: Prices have gone up! Through 10/17, eToys.com is shipping any Halloween Costume over $10 absolutely free, making for some great deals. They have a huge selection (931 total costumes), including Kids Superman for
$12.25 $17.99, Adult Kingpin Bowler for $14.99, Kids White Ninja for $17.99, Kids Star Wars Obi-Wan Kenobi for $19.99, Kids Batman for $19.99 and Kids Hannah Montana for $19.98. Plus, there's no sales tax (except CO, MA, VA).