I posted the Rapunzel Dress Up Dress for under $8 this morning and there is a great deal on the Spider Man Costume Right now on Amazon.
You can get the Spider Man Dress Up Costume for just $7.04 on Amazon (Down from $14.99). Shipping is Free if you have Amazon Prime or when you spend $25 or more on Amazon.com Purchases.
Pricing subject to Change at any time. Please make sure you check the current price on Amazon.com before purchasing.